made frame limiter timings extremely tight and not CPU dependent

greatly accelerated stricmp, netting a 33% reduction in console command overhead
fixed a crash in ConVarRef due to a race
fixed incorrect endif positoning in sseconst.cpp which cleared PC implementation of TransformManyBy
removed busy waits from async texture loading, instead uses mutexes and conditions
removed shader spew from PC
decreased fade time for texture streaming from 5 seconds to 1 second

Author: mastercoms

.gitignore

@@ -35,11 +35,8 @@ server.dll
 server.lib
 
 client.so
-client.so.dbg
 server.so
-server.so.dbg
 server_srv.so
-server_srv.so.dbg
 
 client.dylib
 client.dylib.dSYM/
@@ -61,6 +58,7 @@ config.cfg
 *.pch
 *.pdb
 *.ipdb
+*.dbg
 
 # ignore vs-generated folders
 .vs/