Save toolbar state in localStorage.

This lets us remember the previous mode of the toolbar and keep the UI
consistent.
Make close button bigger, and fix panel close/open when the same panel is re-opened.
Stop using table() method.

There really isn't a good reason to keep it when HTML is much simpler
most of the time.
Make neat arrays a bit nicer.

- New colors brighter colors.
- Unicode instead of ascii chars.