Add more tests to "Entry user style", to spot out lots of bug.
Add more tests to "Entry user style", to spot out lots of bug.

This test is full of TextBlock bugs, just to name a few:
- The window height is wrong, it seems to take the max height as
the win was less large, try resizing to min width to understand what I mean.
- the backing on the em tag is not working.
- the underline colors are wrong.
- popping the style should remove the double underline.
- push/pop on the stack seems not to work as expected: If you push twice
you should need 2 pop to return to the normal state.

rvandegrift/elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary,rvandegrift/elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,tasn/elementary,tasn/elementary,tasn/elementary,FlorentRevest/Elementary