Attempt to fix #3400. Commands added to the CommandBuffer using CMD_EXEC_APPEND should have a newline at the end of the command as the append action does not add the newline automatically.

git-svn-id: https://svn.thedarkmod.com/svn/darkmod_src/trunk@5878 49c82d7f-2e2a-0410-a16f-ae8f201b507f