-Fix a bug that sent all team chat messages to spectators with the same team stored in their UserInfo.

git-svn-id: http://odamex.net/svn/root/trunk@3823 b0bcef46-2027-0410-bd56-ab726e9a1d04
-Use ZDoom 1.23b33's code for calculating a planar equation's coefficients as it tends to be slightly more precise than Odamex's current code.

git-svn-id: http://odamex.net/svn/root/trunk@3825 b0bcef46-2027-0410-bd56-ab726e9a1d04