Game : added 'items.qc' code file, currently empty, for code relating to
pick-up items.
Game : do not use automatic highlighting (EF_SELECTABLE effect), instead
we do it ourselves (set 'colormod').  The previous way would not be able
to handle drag targets (like a lock or an NPC).
Data : added 'quake.rc' file which is needed after all, especially to
process command-line arguments (via stuffcmds).

Also split 'default.cfg' and moved default bindings --> 'bindings.cfg'
which will allow separate "Reset settings" and "Reset bindings" in the
options menu.
small fix
Client : highlight objects in inventory when mouse is over them.
Game : partial work on dragging objects from inventory box.
Screen lib : fully implemented new scaling logic, including 'vid_options'
cvar which has four bits for more control (e.g. 1 = no scaling up).