Enable uuid dependency wasm support

Update bevy version in readme.

Work on fixing CI.

Quality fixes

Working render target example.

Add support for texture atlases

Spinbox impl

implements Add for Style

Bevy 0.8

Port kayak_font to Bevy 0.8

Signed-off-by: HeavyRain266 <heavyrain266@pm.me>

Bump bevy version to 0.8.0

Remove unused bevy features

Fixes #110

Create bevy_event.rs

Allow minimising

Gives an example how to send a bevy event from a button event handler. It took me a while to figure this out so I thought others might find this helpful.