Improve Editing Commands UX

Editing scripts in CopyQ is driving me insane.

The standard (in windows) hotkey "ctrl+s" doesn't save the update (same as "Apply" button) so I keep testing it before it has been saved.

There is no auto indenting (at least to the same level as the last indented line) and the TAB key exits the editor rather than inserts a tab (or 'x' spaces).