remove unused code

common/api/core/src/main/java/com/dfsek/terra/api/addon/Addon.java

@@ -1,11 +0,0 @@
-/*
- * Copyright (c) 2020-2021 Polyhedral Development
- *
- * The Terra API is licensed under the terms of the MIT License. For more details,
- * reference the LICENSE file in the common/api directory.
- */
-
-package com.dfsek.terra.api.addon;
-
-public interface Addon {
-}

common/api/core/src/main/java/com/dfsek/terra/api/addon/AddonLoader.java

@@ -1,21 +0,0 @@
-/*
- * Copyright (c) 2020-2021 Polyhedral Development
- *
- * The Terra API is licensed under the terms of the MIT License. For more details,
- * reference the LICENSE file in the common/api directory.
- */
-
-package com.dfsek.terra.api.addon;
-
-import com.dfsek.terra.api.Platform;
-import com.dfsek.terra.api.registry.CheckedRegistry;
-
-
-public interface AddonLoader {
-    /**
-     * Load all addons.
-     *
-     * @param platform TerraPlugin instance.
-     */
-    void load(Platform platform, CheckedRegistry<Addon> addons);
-}