Create Attributes for Skills

There are a few that need to be done up, like Knowledges etc. but this
should serve for getting the layout right.

Also, I hope this was a sensible way to structure the skill list.
Make __skills_list the default property

No wonder I wasn't getting any output in the Repeater.
Start creating UI for Skills

It doesn't scale with DPI changes.
Remove non-existent import

It's a relic of a failed attempt to do scaling via js.
Create size metrics class

Hopefully, this will let us take dimensions in a DPI scalable way.