unlockPointer tests correctly
Adds pointer lock toggle key
White space and fiddly bits
Adds htmlBlocks.js and some comments
Gets rid of redundant index.js
Turns cubeworld into a function to be called by index.js

- More explicit if things don't happen on load by themselves
Starts display toggling, adds bottom bar (visible for testing)
Adds first html block
Different html for tabs for js functionality, css margin & padding
Styling the inspector tabs. Conundrum.

- Translucent background makes it tricky to color the inactive
tab differently