0.9.0
558: Prepare for release 0.9 r=toasteater a=toasteater After almost a month of preview, the new API seems solid enough for a proper release. - Bumped all version numbers to 0.9.0 - Removed thrid-party resources that aren't updated to 0.9 yet. - Updated CHANGELOG Draft status: maybe we want to wait for Godot 3.2.3-stable release and update the api.json, since that seems close enough? Co-authored-by: toasteater <[email protected]>