Initial setup for OSX frameworks

OSX frameworks are established such that they are referenced at firs
priority when looking for dependencies on cmake. It hasn't been tested
yet.
Headers check will be done on cmake
Essential info now embedded into cmake
A better implementation for the unix signal handler
Use of new symbols

New symbols defined at prereqs.h are being used
A temporary workaround for printing new branding on console

Draw_Console is being profoundly revised to be more programmatic and
less 1337 h4x0r
It was so obvious I'll have to rebase this

Plus, I'll improve this as it is somewhat duplicated.
Some rebranding
Update .gitignore

Ignoring apitrace traces
Introducing filesystem.h

File system has its own header
Introducing system.h

Sys_ prototypes are in his own header
Hotfix for clang
Introducing system.h

Sys_ prototypes are in his own header
Introducing filesystem.h

File system has its own header
Merge branch 'system' of github.com:alericoveri/hecatomb into system
system headers full implementation and cleanup

System function declarations are far more organized now
Formal declarations and cleanup
Merge branch 'filesystem' of github.com:alericoveri/hecatomb into filesystem

Conflicts:
	src/include/filesystem.h
Merge branch 'system' into prereqs

Conflicts:
	src/backends/generic/qgl.c
	src/backends/unix/system.c
	src/common/clientserver.c
	src/common/filesystem.c
	src/common/misc.c
	src/refresh/r_misc.c
	src/server/sv_main.c
Merge branch 'osx-frameworks'