v3.0.0-rc1

Arrow v3.0.0-rc1

This release is a complete revision of Arrow, to upgrade its engine to Godot v4.
Few new features are added along the way as well.

As far as .arrow files, built-in nodes, runtime conventions, editor behaviors, etc. are considered,
no fundamental breaking change is expected; but you may find the following impacting your existing projects:

• Editor config files name and format are changed.
  You may discard the old v2 config.arrow binary files and let the editor create new ones.
  Make sure to set back the working directory if you were using a custom one.
  The new v3 files will be named .arrow.config and are Godot variants serialized in text.

• The project listing files previously called projects.arrow are renamed to .arrow.project.
  You just need to rename them in your projects if you want to use the new v3 editor.

• The UI is recreated to best fit the new generation. There are new themes as well.
  Things may be still a little raw at this point and the nodes way of being displayed on the grid may be different.

This upgrade allows us to take advantage of shiny new features of Godot v4,
specially its superior language server with better support for RTL, CJK and CTL.
We are expecting to have a cleaner UI and more stable UX as well.

I hope you'll find the new Arrow v3 generation interesting.

Best regards