Style cursorAccentColor & selectionColor

[han-tyumi]

Issue type: feature

Description

I would like to add styling for the cursorAccentColor and the selectionColor as these are the only colors not being styled.

For cursorAccentColor, it would be the user's preference or the backgroundColor (#2E3440).
For selectionColor, it would be the user's preference or the cursorColor (#D8DEE9).

Potential Solution

I will be submitting a pull request shortly with these changes.