Merge godot-rust#558

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]>

Merge godot-rust#500

500: Prepare for release 0.9.0-preview.0 r=toasteater a=toasteater

~~Issue number squatting~~ Preparation PR for the 0.9.0 preview release!

Version 0.9 contains a lot of large interface changes that are intended to be solutions to long-standing problems in the API. A lot of good contributions have been merged in the past months, and they are ready for some real-world testing! Since the changes are rather large, we'll release a preview version to weed out any problems before actually committing to the version bump. If no problems are found, this will then proceed to become 0.9!

Draft status: we'll want to clear the other issues in the 0.9 milestone before merging this.

Co-authored-by: toasteater <[email protected]>

Merge pull request godot-rust#388 from toasteater/chore/prepare-0.8.1

Prepare for release 0.8.1

Merge pull request godot-rust#314 from toasteater/chore/prepare-0.8

Add release date and unreleased section.

specify gdnative-bindings version in gdnative crate