throwing, organizing wmcmds, i/adef modding cmds

added a basic form of throwing (although, brainfart since it is early
morning: why did I even add a "throwable" var? everything is
theoretically throwable, should just just be less suitable... to fix).
split wiz mode commands into a couple of functions, based on what they
were related to (level, itemdef, iteminstance, actordef, actorinstance).
a couple remained in the original switch, could maybe be moved into
"gamecmds" or something later. added a whole bunch of commands for
modding item/actor definitions ingame (which you can of course then
save, yay, no more save/def file diving!)