Fix vga palette tricks using objects after free

src/game/objects/har.c

@@ -31,8 +31,10 @@
 void har_finished(object *obj);
 int har_act(object *obj, int act_type);
 void har_spawn_scrap(object *obj, vec2i pos, int amount);
+void har_palette_transform(damage_tracker *damage, vga_palette *pal, void *obj);
 
 void har_free(object *obj) {
+    vga_state_dontuse_palette_transform(har_palette_transform, obj);
     har *h = object_get_userdata(obj);
     list_free(&h->har_hooks);
 #ifdef DEBUGMODE

src/game/protos/object.c

@@ -429,6 +429,7 @@ void object_free(object *obj) {
     if(obj == NULL) {
         return;
     }
+    vga_state_dontuse_palette_transform(object_scenewide_palette_transform, obj);
     if(obj->free != NULL) {
         obj->free(obj);
     }

src/video/vga_state.c

@@ -161,3 +161,14 @@ void vga_state_use_palette_transform(vga_palette_transform transform_callback, v
     state.transformers[state.transformer_count].userdata = userdata;
     state.transformer_count++;
 }
+
+bool vga_state_dontuse_palette_transform(vga_palette_transform transform_callback, void *userdata) {
+    for(unsigned int i = 0; i < state.transformer_count; i++) {
+        if(state.transformers[i].callback == transform_callback && state.transformers[i].userdata == userdata) {
+            memmove(&state.transformers[i], &state.transformers[i + 1],
+                    sizeof(palette_transformer) * (--state.transformer_count - i));
+            return true;
+        }
+    }
+    return false;
+}

src/video/vga_state.h

@@ -38,5 +38,6 @@ void vga_state_set_base_palette_range(vga_index start, vga_index count, vga_colo
 void vga_state_copy_base_palette_range(vga_index dst, vga_index src, vga_index count);
 
 void vga_state_use_palette_transform(vga_palette_transform transform_callback, void *userdata);
+bool vga_state_dontuse_palette_transform(vga_palette_transform transform_callback, void *userdata);
 
 #endif // VGA_STATE_H