Add editor setting to make tab always indent the line

[jmdejong]

See https://github.com/godotengine/godot-proposals/issues/7816

This add a setting to always make the tab key indent the current line in a code editor

• Bugsquad edit, closes: https://github.com/godotengine/godot-proposals/issues/7816

[jmdejong]

If anyone can thing of better naming and description please let me know.

There should probably also be tests for this behaviour, but I'm not sure whether it would be better to expand the existing tests or to add new tests.

[mieldepoche]

I think it would be better to document that using the enum style, as in each option has its own line for clarity:

[jmdejong]

I like how it looks in enum style. The specific way it's done in your example is not use anywhere else in edtor_settings.xml, so I made a multiline description that matches the other dropdown editor settings more

[mieldepoche]

I just thought of it now, but I'd personally rename "Advance" to "Insert". It's what it does, as stated in the doc string.

Also, this sentence should have a . at the end (idk how to suggest changes in github, or if I even can)

[jmdejong]

Makes sense. I changed it