v2.7.7

Changes:

• Fixed GUIManager.BlockInput also blocking Escape from opening the menu in-game
• Fixed Shader mocking and enabled it again. Shaders are a bit special and only those that are correctly marked as mocks are resolved, please see https://valheim-modding.github.io/Jotunn/tutorials/asset-mocking.html#shader-mocking
• Fixed disabling a piece inside a PieceConfig was not working
• Made UndoCreate and UndoRemove more extensible