Mweb font size 189

Default font size is now 16px. Mobile web is also inheriting, along with baseFontSize, smallFontSize and bigFontSize etc. Removed a few of the extra font overrides in places like touchlist and took care of some todos/kill me's. Other tweaks are related to getting certain elements to look right with the new, bigger mobile sizes.

Also added some documentation - mobile type spec.