* When an object is selected (or when "Edit object" button is clicked in the properties panel after choosing an instance), the properties panel will show the properties of the object.
* This allows for fast edition of most elements of an object: appearance, properties, but also behaviors, variables and effects. Most workflow and iterations on your game should be faster, from adapting the appearance of a text to tweaking behaviors and updating the preview to check the result in realtime.
* Allow extensions to store EffectMetadata.
* Rework gdjs.PixiFiltersTools to allow new effects to be dynamically registered.
* Update EffectsList to read effects from extensions.
* Update GDJS ExporterHelper to export include files for effects
* Rename effectName to effectType to avoid confusions in gd::Effect
* Update all CMakeLists of extensions to use clang-format
* Run clang-format on all Extensions
* Update GDCore CMakeLists.txt to add clang-format
* Run clang-format on GDCore files
* Update GDJS and GDCpp CMakeLists.txt to add clang-format
* Run clang-format on GDCpp and GDJS files
