patch to use cmdline options, focus fixes

[Taylor Richards]

Here is the patch to add command line option support to gropengl.cpp and
os_unix.cpp.  One particular note about this patch, fullscreen is
default.  I don't mind putting this back to windowed but this has been
asked for enough.  Also the mouse is grabbed automatically unless you
tell it otherwise (-g | --nograb).  The rest should be pretty
self-explanatory.  One bug fix was for SDL_APPACTIVE which wasn't being
tested for properly.  Comments?

One thing that I forgot to mention on the previous patch was that the
file Data/cmdline.cfg is parsed for options that aren't specified on the
command line.  It will look in ${HOME}/.freespace2 first and then the
executable directory.  Options in this file are specified exactly as
they are on the command line itself.


Taylor

-- 
Taylor Richards <mtrs at bellsouth.net>
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