GDScript: partially allow some functions on invalid scripts

+ always default initialize static variables
+ dont invalidate script when dependant scripts don't compile/resolve

modules/gdscript/gdscript_cache.h

@@ -48,7 +48,6 @@ public:
 		PARSED,
 		INHERITANCE_SOLVED,
 		INTERFACE_SOLVED,
-		BODY_SOLVED,
 		FULLY_SOLVED,
 	};