Standardize hidden mission achievement in new Lua library "Achievements"

Add proper exit codes when halt-ing hwengine due to error

Fix cursor teleporting to center after leaving game with video recording

Whoops. Syntax error in uVideoRec

Fix video recorder not working if sound disabled (fixes bug #200)

Add variable to make state of sound system clear

Fix hwengine crash when using >1 controllers Reason: Data type mismatch for SDL_JoystickName, we wed in an index, but it expected a controller handle. Solution: Switch to SDL_JoystickNameForIndex.

Always use SDL_Map(A)RGB in SDL_FillRect for color This practice is recommended by official SDL docs.

When hwengine crashes w/ error 217, write backtrace in log, too By using WriteLnToConsole to achive that.

Fix hwengine --help returning with exit code 51