consolidated many mempools to make memlist more readable (and very slightly reduce...

consolidated many mempools to make memlist more readable (and very slightly reduce memory usage)
changed gltexture_t->identifier from a pointer to an array to reduce the number of allocations per texture (now 2-3 rather than 3-4)
made all MAX_EDICTS arrays in entityframe5_database_t adaptive size to reduce server memory usage

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@5158 d7cf8633-e32d-0410-b094-e92efae38249