Further tweaks to helm appearance, now simply take up the full frame
with it's completion UI. When follow mode is enabled, have preview
appear in bottom half of the window.
Some commands which output to compilation buffers did not get their
output colorized correctly by default. This ensures that terminal based
escape sequences are correctly handled.
Instead of manually just setting faces after loading a doom-themes
theme, let's use a custom override theme which we apply right after
applying any doom-themes theme.
The override theme uses various doom-color helpers, so the colors it
uses will be based on the most recently applied doom-themes theme.
I've been using doom-themes' doom-vibrant for long enough now that I'm
certain I won't be moving away from it anytime soon. So let's simplify
and strip away all other theme setup stuff.
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.
All siren modules lazy-load if they can, so there's no need to
lazy-require a siren module.
Also this avoids the annoyance of the first time you use a feature
it triggers a package install from melpa. All such things should
happen as part of Emacs startup.
I've taken a lot of inspiration from Emacs-Prelude when it came to the
structure of this rewritten config. I didn't want to use Prelude as I
don't agree with all it's defaults, nor do I want to have to deal with
any future changes in Prelude that might break things for me. So instead
I went down the fully custom path, but heavily inspired by Prelude, both
in terms of file/code structure, and also some of it's features.
Compared to my old config setup, it's got most of the same things, but
nearly everything is in a module file now, making it easy to fully
enable/disable certain features.
