* eframe README: explain how to enable copy/paste
* Implement Debug for a couple of structs
* Code cleanup
* Better docs
* profile ron serialization
* CI: Allow "exclude from changelog" as the only label
* Imoprove docs for callback shapes
* Improve docs for loader traits
* Use snake_case for feature `all_loaders`
* Make loaders publix
* Slightly better error message on image load failure
* Improve image loading error messages
* Use `bytes://` schema for included bytes loader
* Try user loaders first
* Move `image_loading_spinners` to `Visuals`
* Unify and simplify code
* Make the main text of `Button` optional
This largely makes ImageButton obsolete
* Fix docstrings
* Better docs
* typos
* Use the more explicit `egui_extras::install_image_loaders`
* Simplify `Image::paint_at` function
* Improved wgpu callbacks
* update documentation on egui_wgpu callbacks
* make shared callback resource map pub
* make it nicer to create epaint::PaintCallback from egui_wgpu callback
* constrain ClippedPrimitive lifetime to outlive wgpu::RenderPass
* Revert callback resources to TypeMap, put finish_prepare on callback trait
* doc string fixes
