This caches `g_UnitActions` sorted, which was computed in `input.js` on every tick. Since `g_UnitActions` does not change in the progress of a game it can be cached upon init.
Relevant timing differences:
- Init: From non-existent to ~130 microseconds.
- OnTick: From ~100 to ~5 microseconds.
Why this is bad:
- It introduces another global variable. (I would say we can just sort `g_UnitActions` itself, for we have no need of the unsorted variant?)
Why this is good:
- It speeds up `determineAction` in `input.js`.