Development changes for CProjector, CWeaponStatMgun, bind_monster.script

[GhenTuong]

• CProjector: Further development. Export functions and register class to be useable in LUA.
• CWeaponStatMgun: Register class to be useable in LUA. Fix some minor bugs/oversights. (eye_direction, animations, kick owner out on net destroy).
• bind_monster.script: Add an option to make online mutant squads run toward squad target instead of walking. (for making mutant attack quests).

[themrdemonized]

Add a BONE_POSITION_WARNING to allow modders to disable warning spam of bone_position when enabling debug.

There is already print_bone_warnings console command that toggles it, no need for another define

[GhenTuong]

BONE_POSITION_WARNING changes was removed.

[themrdemonized]

Also i think S_STMGUN and S_SEARCH should be changed to _S_STMGUN and _S_SEARCH respectively, that way they will be added in the end of existing classes, so it won't break their order. I honestly don't know how critical it is for those classes, so let me know if it works fine either way

[GhenTuong]

It worked fine to me so far but let be safe than sorry.
Changes to add "_" to class names were checked in.