* Create scripting hook: 'On Options Menu Tab Changed'
It would be very useful to know which options tab is active (IE Options, Multi, Detail) but it's all under one single Game State `GS_STATE_OPTIONS_MENU`.
This PR creates a hook, 'On Options Menu Tab Changed' that returns the value of the newly switched to options tab. Lafiel and I both discussed making this an ENUM, but the ENUM list is already quite bloated and this integer value seems like the cleanest solution.
Tested and works as expected.
* fix description typo