Note in changelog about KeyPadEnter to KeypadEnter
This introduces some breaking changes like the `imgui::Key` now contains a full set of keys (previously it was a small subset of to cover copy/paste/undo)
+ Also note `Key::KeyPadEnter` was renamed to `KeypadEnter`
+
- freetype feature can now locate required libraries either via `pkg-config` or `vcpkg`
- Breaking (partially): `ImageButton::new` is now deprecated, replaced by `ui.image_button_config(...)`.
