Indent/Unindent Selected Lines

[tom-ludwig]

Description

New Shortcuts:

• tab increases indention level
• ⇧ tab decreases indentation level
• ⌘ ] increases indention level
• ⌘ [ decreases indentation level

The keyboard shortcuts also work with multiple cursors.

Blocker:
1. The functions aren't connected to the editor's settings, meaning the space count is hardcoded to 2 spaces for now.
2. In the current implementation, the user cannot use the Tab key as expected.

Related Issues

• closes ✨ Indent selected lines #220

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code
• I've added tests

Screenshots