broke the test rig page up into lots of separate files

The Quby test rig page is now changed from one giant
page, to lots of separate files.

Most of all, the different qb files are now moved into their own
files, and are selectable within the test rig. No more having to edit
source code to switch between them!
test rig now remembers qb test file between reloads

When you refresh the page, it will now display the test
page you were using before, on the next reload.

This is achieved by saving which file you are currently
viewing in the cookies.