Lots of little changes

Remove lua from the source tree; relying on external lua sources for now

Update install_arch_packages.sh

Update scripts to work with lgob instead of lgi

Remove _O_BINARY from w_wad.c

Update CMakeLists.txt to check for Lua and lgob

Add v_main.c to CMakeLists.txt

Remove unused signal handler code from SDL/i_main.c

Convert LUA_OK's into 0 in v_main.c (for Lua 5.1)

x_types ought to be x_type_e, fixed