IBIze on non-windows

still to do: fix missing -a option, fix on PPC, check ncurses stuff
NPCs controlled by Mind Trick Level 4 now have: Viewweapons in first person, corrected camera, and can be properly exited using the JUMP key.
Linux dedicated will now use Sys_SnapVector from unix_shared.cpp
Merge pull request #67 from exidl/master

Linux dedicated Sys_SnapVector ultimate fix
ibize stuff #2

don''t bother with -a or -e options on non-windows; still need to look
at endianness stuff for the unlikely situation of someone using ibize
on PPC
Merge remote-tracking branch 'upstream/master'
a few mac changes
mac dedicated server now has .dylib extension for dlls not .so
Sys_SnapVector linux re-fix