Move Chat View colors to new settings page

Move Chat View colors to new settings page

Add new settings page Chat View Colors for "allowMircColors",
"useCustomColors", "useSenderColors", and related color buttons.

Remove the above settings from the general Chat View settings page.
Add missing tab stops for "autoMarkerLineOnLostFocus" and
"webSearchUrlFormat".

This reduces visual clutter, improves organization, and saves
vertical space, helpful for smaller screens.
(~54 pixels saved vs 0.12.4, ~112 pixels saved vs all options in one)