WARNING: THIS IS A BREAKING CHANGE FOR THEME/FONT/NLINUM CUSTOMIZATIONS.
This change was motivated by the need to decouple theme and font loading
from the ui/doom module.
Now, it is doom-core's purview. Theme and fonts are loaded after
initfiles are read (attached to the doom-init-ui-hook hook), giving
other modules (especially private ones) a chance to change the theme or
fonts.
+ Refactor core-ui.el
+ New init hook: doom-init-ui-hook
+ Decouple theme/font loading from ui/doom
+ Load modelines are doom-init-ui-hook
+ New theme/font variables (replaces old ui/doom variables)
+ doom-theme
+ doom-font
+ doom-variable-pitch-font
+ doom-unicode-font
+ Change nlinum variables
+ doom-line-number-lpad
+ doom-line-number-rpad
+ doom-line-number-pad-char
Addresses #117
