Add FilterTriggerMoved native.

Add OnPrePlayerThinkFunctions and OnPostPlayerThinkFunctions forward.

include/CSSFixes.inc

@@ -4,8 +4,16 @@
 #define _cssfixes_included
 
 forward void OnRunThinkFunctions(bool simulating);
+forward void OnPrePlayerThinkFunctions();
+forward void OnPostPlayerThinkFunctions();
 forward void OnRunThinkFunctionsPost(bool simulating);
 
+// -1 = Ignore, normal operation.
+// 0 = Block ALL SV_TriggerMoved.
+// >0 = Entity index for which to allow EnumElement to be called.
+// REMEMBER TO CALL THIS AGAIN WITH -1 AFTER USING IT !!!
+native void FilterTriggerMoved(int entity);
+
 public Extension __ext_CSSFixes =
 {
 	name = "CSSFixes",