VIM keybinding support

Hello,

Gdevelop is all about productivity and it does a great job at that. The one thing letting it down for me is the lack of keybindings for the code editor.

It’s based on Monaco Editor, which is extracted from Visual Studio Code.
Default key bindings (Alt+arrow key, Alt+Shift+arrow key, Cmd/Ctrl+D for multi selection) are supported but indeed I’m not sure there is any “VIM mode” working without an extension/plugin.
Any contribution is welcome to add this :slight_smile: