Misc Cleanup

[XaserAcheron]

Lots of refactoring n' cleanup to do at some point, for sanity's sake:

• Split all the base.txt files up into properly-named files (e.g. argWeapon.txt, argModWeapon.txt...).
• Replace mod[] array with mod1/mod2 vars now that mods are classes.
• Remove ArgCounter from the project; that's some ugly bunk.
• Remove action keyword from non-Weapon/Inventory functions.
• Replace Arg_ function prefixes with something simpler, like X_. Easier to read that way.