Revert "add a bunch of mutexes and shit but still have racist conditions and panics LOL"

This reverts commit 220a451475.

assets/assets.go

@@ -85,3 +85,19 @@ func LoadModels() ([]types.ModelAsset, error) {
 func LoadMusic(filename string) (rl.Music, error) {
 	return rl.LoadMusicStream(filename), nil
 }
+
+func UnloadModels(models []types.ModelAsset) {
+	for _, model := range models {
+		if model.Animation != nil {
+			for i := int32(0); i < model.AnimFrames; i++ {
+				rl.UnloadModelAnimation(model.Animation[i])
+			}
+		}
+		rl.UnloadModel(model.Model)
+		rl.UnloadTexture(model.Texture)
+	}
+}
+
+func UnloadMusic(music rl.Music) {
+	rl.UnloadMusicStream(music)
+}