This changed spawned from trying to make certain text colors readable (such as white text on white background in many dialogs) introduced by commit 4ee2bc6 (ref: #5841) which made obvious the need to improve the color and contrast situation in the theme.
Alot of colors were duplicated in cascade.css and made for a hard time to align colors across different elements. This commit tries to rectify that by introducing variables for all commonly used colors.
* All base colors (white, blue, red, green, blue, yellow, etc) has been consolidated and moved to common variables
* Introduced more specific selectors for info levels to avoid colors bleeding over to other elements
* Removed duplicated properties which were overriden at the next row
Signed-off-by: Daniel Nilsson <daniel.nilsson94@outlook.com>