Turns out running (magit-delta-mode -1) to "disable" or ensure it's
disabled as a magit-mode-hook was a bad idea, as it set
magit-diff-refine-hunk to nil.
So instead, we only call magit-delta-mode when siren-magit-delta-enabled
is not nil, and the delta executable is available.
Disabled by default, as the syntax highlighting can make code harder to
read in the diff. Hence disabled by default, and easy to toggle on if I
want to try it.
This module wraps around the fill-column-indicator and it's
fci-mode. This will enable easy switch-over to Emacs 27's native
display-fill-column-indicator feature.
Also create a new siren-display-line-numbers module and function that's
responsible for turning on the display of line numbers. Future changes
to how line numbers are displayed can now be done in a single place.
Latest master build of magit seems to have issues with the status
buffer, where it turns on syntax high-lighting for quoted strings and
other weirdness that leaks all over the status buffer.
