Quiet Clang Static Analyzer warnings.

Most of the warnings were caused by uninitialized values. Some were in plug-ins that didn't have a break in a switch, causing the memory to be deleted twice.

scripts/LEVEL0.cpp

@@ -798,6 +798,7 @@ void STDCALL DestroyInstance(int id, void *ptr) {
   switch (id) {
   case ID_LEVEL_0000:
     delete ((LevelScript_0000 *)ptr);
+    break;
   case ID_CUSTOM_OBJECT_3855:
     delete ((CustomObjectScript_3855 *)ptr);
     break;