Make DescriptionBox used fixed size font

It looks okay so far, but I *really* need to find a real font for
this.

Also, using ColumnLayout has made HitPoints look retarded - should
maybe fix that by using a Column instead.
Create RoundedDescriptionBox

It's for the black boxes with the pointed corners, like BAB/Skills
etc.
Create the next Row, containing BAB and SR
Create separate class for a Spacer

Instead of using ad-hoc Rectangles. Also, these have opactiy and
dimensions set by default.
Start creating the next Row, CMB/CMD

Still have to do the CMD part, but too sleepy now.
Add CMD to CombatManeuversArea
Fix height of CombatManeuversArea