Re-implement King Dodongo's Lava texture effects (#3434)

* fix alt backgrounds not always loading

* include gfx lookup with the original unload

* Add hook for alt toggle

* handle cpu modified texture for kd lava

* malloc array instead of illegal initialize

soh/src/code/z_room.c

@@ -277,6 +277,11 @@ void func_8009638C(Gfx** displayList, void* source, void* tlut, u16 width, u16 h
     bg->b.imagePal = 0;
     bg->b.imageFlip = CVarGetInteger("gMirroredWorld", 0) ? G_BG_FLAG_FLIPS : 0;
 
+    // When an alt resource exists for the background, we need to unload the original asset
+    // to clear the cache so the alt asset will be loaded instead
+    // OTRTODO: If Alt loading over original cache is fixed, this line can most likely be removed
+    ResourceMgr_UnloadOriginalWhenAltExists((char*) source);
+
     if (ResourceMgr_ResourceIsBackground((char*) source)) {
         char* blob = (char*) ResourceGetDataByName((char *) source);
         swapAndConvertJPEG(blob);