Added Latin-1 Supplement (160-255) and the replacement character (65533
or "�")

Cleaned up API. Also added some new types to better encapsulate logic
and layout information.

Start upgrade to bevy 0.7

- [x] `GpuImage` requires `texture_format` now.
- [ ] `ActiveCameras` was removed
  - https://github.com/bevyengine/bevy/commit/bf6de8962287050369cd98605490bdd7770c87b4
- [x] `CachedPipelineId` is now `CachedRenderPipelineId` and renamed `RenderPipelineCache` to `PipelineCache`
  - https://github.com/bevyengine/bevy/pull/3979

Fixed DPI issue for images.

Added show_cursor prop on Text widget to achieve same effect

Change default font

Fixed wrong mutable state for world.

Added `ScrollBox`

Fixed missed layouts for on_layout

Add ability to recursively render/layout so that nodes that depend on
layout have a better chance of initial success

bevy_kayak_renderer: Fix clipping not working

This was due the x position surpassing the width of the element, but
this should not cause the element to not be clipped.