Godot 3.5 support

[Bromeon]

Integrates support for Godot 3.5.1, including:

Godot

• Updated api.json + XML documentation
• Version compatibility warning to avoid accidental mix-ups
• CI suite for new engine version (+ support for RCs)
• Backwards compatibility down to Godot 3.2, when using custom-godot feature

Rust

• MSRV 1.63
• Updated crate dependencies

[Bromeon]

Godot 3.5 has been released as per announcement. I'll see if I find some time soon to look into this.

If anyone can help with https://github.com/godot-rust/godot-rust/issues/894 (reproduce, debug, etc) that would be hugely appreciated. If I work alone on this, it will likely delay GDExtension.

[crabdancing]

This looks pretty good to me. I pulled and compiled, and the logic of the demos seems to be working fine as well. :)

[voice-of-texnoforge]

I've used

gdnative = { git = "https://github.com/Bromeon/godot-rust.git", branch = "feature/godot-3.5" }

and it seems to work fine for my simple demo.

Thanks for working on this 👌🏿

[Bromeon]

bors try

[bors[bot]]

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[Bromeon]

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[Bromeon]

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[Bromeon]

Updated api.json and XML docs to Godot 3.5.1 RC1. It probably makes sense to merge this, once that bugfix release sees the light of day.

bors try

[Bromeon]

Jobs failed due to GitHub outage and lack of network connectivity.

bors retry

[Bromeon]

bors try- bors retry

[bors[bot]]

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[Bromeon]

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[Bromeon]

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[Bromeon]

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[Bromeon]

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Build succeeded:

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[Bromeon]

Godot 3.5.1-stable has been released 20min ago, not even an announcement yet! 🙂

So the way is free for this. Please bring up any last-minute remarks.

[Bromeon]

bors r+

[bors[bot]]

Build succeeded:

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