Fix Coverity ID 1228858 Missing varargs init or cleanup

In required_string_one_of(int arg_count, ...)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10948 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity 1228854 Copy-paste error

Check pof_file_hud for "$POF target file:" not pof_file ("$POF file:")

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10949 387891d4-d844-0410-90c0-e4c51a9137d3
Fix gcc warnings in globalincs/alphacolors.cpp

warning: declaration of ‘i’ shadows a previous local [-Wshadow]

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10950 387891d4-d844-0410-90c0-e4c51a9137d3
From MageKing17:  Followup to r10914. Makes the name check ignore case.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10951 387891d4-d844-0410-90c0-e4c51a9137d3