Fix Coverity 1093822 Uninitialized scalar variable

Set sensible looking defaults for the elems added to the beam_collision
struct since retail

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10956 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Coverity ID 1093805 Uninitialized scalar variable

1st use of fbfire_info.bfi_flags so assign instead of |=

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10957 387891d4-d844-0410-90c0-e4c51a9137d3
Doh! Assign, not equality!

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10958 387891d4-d844-0410-90c0-e4c51a9137d3
Fix a render target bug by disabling environment mapping when doing full-scene RTT.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10959 387891d4-d844-0410-90c0-e4c51a9137d3
Fix mantis 3073: Additional Mainhall capabilities (from ngld)

Adds two new mainhall.tbl options:
1) "+Misc anim over doors:" (misc anim rendered after doors)
2) "+Cheat String:" (exchanges misc anim when cheat is entered)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10961 387891d4-d844-0410-90c0-e4c51a9137d3