we don't need to cast because mod is a float

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11124 387891d4-d844-0410-90c0-e4c51a9137d3
xt branch: tweaks to vecmat.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11125 387891d4-d844-0410-90c0-e4c51a9137d3
xt branch: optimizations in fvi.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11126 387891d4-d844-0410-90c0-e4c51a9137d3
xt branch: having a float version of gr_opengl_string makes text scrolling nice and smooth at high nonstandard resolutions (also, looks like quad rendering works just fine here; no need to convert to tris)

convert credits.cpp to use float version of gr_opengl_string; eventually Taylor wanted to make the float version standard

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11127 387891d4-d844-0410-90c0-e4c51a9137d3
xt branch: add capability for custom identifiers in build names (e.g. Xt-0314)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11128 387891d4-d844-0410-90c0-e4c51a9137d3
xt branch: optimizations in modelcollide.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11129 387891d4-d844-0410-90c0-e4c51a9137d3