1. Hardened various parts of the API
2. Moved the ApplyMainMenu logic into the main API file for centralization
3. Added some useful log statements for when log mode is on

1. Minor comments fixes
2. Standardized the interface function signatures (!). Both are now context, templateName, unitState, in that order.

I've only done #2 since no mods integrate yet, aside from my own dev build of Advent Angels.
Going forward, V1 interfaces will not change, since mods using unofficial signatures CTD.
I tried getting it all buttoned up ahead of time for the initial release, but it was a huge lift. :)

Initial release.