v2.0.0 Release

⚠️ This is a major version release, which means it is not backward compatible.

Updates & new features include:

• Addition of Passwords and Password Categories endpoint
• Addition of filtering capabilities for all endpoints
• 1:1 feature parity with IT Glue's current API documentation
• The $data parameter no longer requires you to wrap all of the information in a hash table that includes a data key. Now, just the attributes and other related information can be tossed in as a single hash table, which matches IT Glue's developer documentation examples.
• Removal of the now-defunct Favorite Organizations endpoint
• Support for EU data center base URIs
• The API key can now be passed to Add-ITGlueAPIKey via the pipeline.

Semantic Versioning is now in place. Given a version number MAJOR.MINOR.PATCH, increment the:
-- MAJOR version when you make incompatible API changes,
-- MINOR version when you add functionality in a backward-compatible manner, and
-- PATCH version when you make backward-compatible bug fixes.

Some minor edits pertaining to code style and continuity are present.

Thank you to @adrianwells for his contributions. I know this has been a long time in the making.

(The above text is copied from the PR comment which is related to this commit, thank you to @CalebAlbers for this contributions!)