* Made AIL_crouch more useful.

* The LUA AI can now request a specific crouching state.
* Made AI_TryToReloadWeapon a shared AI function.
* Improved AIL_reload().

* Now uses AI_TryToReloadWeapon().
* New LUA AI functions: 'isarmed' and 'getweapon'.
* Improved AIL_roundsleft.

* Now allows to check when a weapon is unusable due to being unloaded.
* Removed unneeded LUA param from AIL_reactionfire.
* Comment.