Shouldn't break scripts as it stops execution as soon it happens, like it already does.

* create new file lua_polyobjlib.c
* made a stub LUA_PolyObjLib function
* added META_POLYOBJ to lua_libs.h
* updated makefile, CMake and MSVC project files for lua_polyobjlib.c

Basically any function that calls fopen() is gone,
except the ones created by me.

And no access to stdin/stdout/stderr
through io.read()/io.write().
Not really harmful but why would you want that in SRB2.

open() for normal, consistency-friendly reading,
openlocal() for writing and local reading.

my P_SearchBlockmap_* functions are now a single searchBlockmap function, you can choose between "objects" and "lines" with the first arg to decide what to iterate through. I also rearranged the argument order a bit for easy stack cleanup etc

I'll remove the old stuff later, don't worry, it's disabled for now

I can't just say screw it and include the full
doomtype.h here (windows.h conflict?) so a
small hack here will have to do. :I

Angles now go from 0 to 0xFFFF (360 degrees == FRACUNIT) instead
of using a full UINT32. Lua only has one number type, so signedness
gets in the way of using angle_t directly. This handling of angles
matches up with how ZDoom ACS scripting and the like does it.

I also changed all the integer casts and pushes of fixed_t to
their own macro in preperation for possible future seperation.