Add font properties to IUiBuilder

[Critical-Impact]

This provides properties that match the static UiBuilder counterparts. Ideally the statics should go but I've conceded that point, I understand the convience factor, though it does make for a leaky interface

For those using DI, unit tests/mocks/etc this should allow for parity

[Critical-Impact]

Anything blocking this one? Only adds to the interface and allows for plugins to not have to rely on a static