[DieTeetasse]

Tested follow versions and all seems to work:
- Left 4 Dead 2 Windows
- Left 4 Dead 2 Linux
- Left 4 Dead 1 Linux

Tested the commands: sm_flip, sm_nograv_all, sm_grav_all, sm_freeze_all and sm_unfreeze_all.

But in all version it seems that these commands not affect all "physical" entities. Computer monitors, cans, some boxes and all the trash on the ground will not be affected in both Left 4 Deads.