Build: Add CSSMin task

- Minify all CSS on build
- Move all minification to a "minify" task
Build: refactor targets

Separate out chained task to more atomically related actions
Added Font logic for porting fonts from Bootstrap lib
Merge pull request #2976 from masterbee/hotfix--fontmapping

Added Font logic for porting fonts from Bootstrap lib
Markup: Changed aria-labelled-by typo to aria-labelledby (#2968).
Merge pull request #2977 from pjackson28/fixmarkup

Markup: Changed aria-labelled-by typo to aria-labelledby (#2968).
Merge pull request #2974 from nschonni/v4.0-add-cssmin

V4.0 add cssmin