* Anchor an edge of an object to set its distance from the window edges. Single anchor will not stretch the object anymore; you will need to set anchors to object's opposite edges for this effect.
* Add a button to switch between legacy and new behavior.
Don't show the rest in changelog:
* More generally, fix resources exposed by any object declared in JavaScript
* Refactored GetProperties (and UpdateProperty) across behavior/object/behavior shared data to remove the dependency on gd::Project.
* 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
* Add AnchorBehavior
* Improve the AnchorBehavior
* Add an icon to the AnchorBehavior
* Code cleaning in AnchorBehavior
* Add more icons for the AnchorBehavior