Created a global editor settings dialog #433
Draft
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Added basic editor settings menu, with only one option.
No functionality added to save these configuration options
due to too much new code to handle it.
The interface will require new UI components,
as the current ones are not suitable for this dialog.
I created this pull request because I wanted to implement line numbers #432,
but I also didn't want to clutter the menu bar with unnecessary options.
Incidentally, this enabled the implementation of new configuration options #22.
I'm not really sure where to put the new settings button in the menu bar?