Mythic Plus Rating Gain

Works in TWW and will now give you a score gain for 2-chest and 3-chest.

Type /rg <key level> in chat and the score gain for each dungeon at that key level will be output to the chat window.

You can request 2-chest and 3-chest gains by adding a +2 or +3 after the key level.

i.e /rg 14 +3 will give the 3-chest gains for a +14 key

Thanks to Withertea for letting me know there was a source for score data. I found score data in the raider.io FAQ and with some testing I got my formulas working.