Add Session Lengths to the Event Info Widget

[tomjackman]

What
Add Session Lengths to the Event Info Widget

Why
It would be useful to see the session lengths.

How
Added session lengths, classes with color indicators, tyre compounds using some data available from the session info API.

r3e.getSessionInfo(function(sessionInfo) {
    /*
    // type can be:
    'Unknown',
    'Practice',
    'Qualify',
    'Warmup',
    'Race 1',
    'Race 2',
    'Race 3',
    'Event Results'

    // phase can be:
    'START',
    'WALKTHROUGH',
    'GARAGE',
    'FORMATION',
    'COUNTDOWN',
    'GREEN',
    'CHECKERED',
    'END'

    // sessionInfo
    {
        "type": "string",
        "phase": "string",
        "timeTotal": "int", //seconds
        "timeLeft": "int" //seconds
    }
    */
});