WCAG data cleanup

• Remove duplicated “Principle n: Principle_Name - ”: s/Principle [0-9]: (.*) - //
• Remove unnecessary colons from handles: s/"handle": "(.*):",/"handle": "$1",
• Add 1.1.1 advisory techniques:

{
   "advisory": [
        {
            "situations": [
                {
                    "title": "General Techniques for Informative Non-Text Content",
                    "techniques": [
                        {
                            "id": "TECH:future1",
                            "title": "Identifying informative non-text content"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Keeping short descriptions short"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Describing images that include text"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Providing a longer description of the non-text content where only a descriptive label is required using a technology-specific technique (for an accessibility-supported content technology) for long description listed above"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Providing different sizes for non-text content when it cannot have an equivalent accessible alternative"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Using server-side scripts to resize images of text"
                        }
                    ]
                },
                {
                    "title": "General Techniques for Live Non-Text Content",
                    "techniques": [
                        {
                            "id": "TECH:future1",
                            "title": "Linking to textual information that provides comparable information (e.g., for a traffic Webcam, a municipality could provide a link to the text traffic report.)"
                        }
                    ]
                },
                {
                    "title": "General techniques to minimize the barrier of CAPTCHAs",
                    "techniques": [
                        {
                            "id": "TECH:future1",
                            "title": "Providing more than two modalities of CAPTCHAs"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Providing access to a human customer service representative who can bypass CAPTCHA"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Not requiring CAPTCHAs for authorized users"
                        }
                    ]
                },
                {
                    "title": "HTML Techniques",
                    "techniques": [
                        {
                            "id": "TECH:H46"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Writing for browsers that do not support frame"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Providing alternative content for iframe"
                        },
                        {
                            "id": "TECH:H27"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Not using long descriptions for iframe"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Providing redundant text links for client-side image maps"
                        }
                    ]
                },
                {
                    "title": "CSS Techniques",
                    "techniques": [
                        {
                            "id": "TECH:C18",
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Using CSS background, :before or :after rules for decorative images instead of img elements"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Displaying empty table cells"
                        }
                    ]
                },
                {
                    "title": "WAI-ARIA Techniques",
                    "techniques": [
                        {
                            "id": "TECH:future1",
                            "title": "Using the ARIA presentation role to indicate elements are purely presentational"
                        }
                    ]
                },
                {
                    "title": "Silverlight Techniques",
                    "techniques": [
                        {
                            "id": "TECH:SL19"
                        }
                    ]
                },
                {
                    "title": "Metadata Techniques",
                    "techniques": [
                        {
                            "id": "TECH:future1",
                            "title": "Using metadata to associate text transcriptions with a video"
                        },
                        {
                            "id": "TECH:future1",
                            "title": "Using metadata to associate text transcriptions with audio-only content",
                            "using": [
                                {
                                    "id": "TECH:future1",
                                    "title": "EXAMPLE: Providing, in metadata, URI(s) that points to an audio description and a text transcript of a video."
                                },
                                {
                                    "id": "TECH:future1",
                                    "title": "EXAMPLE: Providing, in metadata, URI(s) that point to several text transcripts (English, French, Dutch) of an audio file."
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ]
},