rollerblade skates item proposal

Initial commit for the proposal of rollerblades item, a type of shoe
that offers double movement speed on flat ground, but half otherwise and
has a chance to get you knocked down if used while getting attacked.
Open to suggestions.
The downed disease takes care of saying you've been knocked down. It also adds a description of you bing on the floor in the status screen effects tab.
Even if you're knocked down by a bad step, your dodge is not interrupted, so you can still get away while on the floor. It takes more time for you to get up, but you can still fight as normal. This is a limitation of the downed disease effect, which is, apparently, very tame if you are either dexterous or strong. If you're not under very low stats, the downed disease will very rarely affect you by removing 100 move points.
I don't know if this design was intended differently, but it seemed to me like the easiest way and the most appropriate of implementing falling to the ground while conscious.