Improved logging system.

Made generic flags for log event types.
Made support for module filtering. Note: Manager for module filtering is not implemented. Don't enable filter when testing, otherwise nothing will be logged.
Updated all log events.

src/zombiereloaded.sp

@@ -18,6 +18,9 @@
 
 #define VERSION "3.0-dev"
 
+// Header includes.
+#include "zr/log.h"
+
 // Core includes.
 #include "zr/zombiereloaded"
 #include "zr/translation"