xcode: updated project to include new source files

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2371 86ba831e-150c-0410-ab35-e06eaae15ed9
osx: added support for .disk files in the launcher.

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2372 86ba831e-150c-0410-ab35-e06eaae15ed9
osx:
* removed some dead weight
* rearranged some code to fit the 80 width, now that i find that useful
* now directories can be loaded into the add-on list table
* now disk images can be loaded both into main game and add-on lists, and won't be saved into GFS. Worked around it to make it reject other files which shouldn't be files (this definitely needs some further designing, probably in a new branch)

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2373 86ba831e-150c-0410-ab35-e06eaae15ed9
osx: fixed a coding mistake which prevented multiple PWADs from being loaded

git-svn-id: http://mancubus.net/svn/hosted/eternity/trunk@2374 86ba831e-150c-0410-ab35-e06eaae15ed9