Make width & height a config option
Simplify anchoring
Remove specialisation requirement for stagger bar

It is not possible to fetch the player spec right away, and using
PLAYER_ENTERING_WORLD event also introduces some weitd behaviour, so
simply always creating the stagger element now in the case of a monk.

Later it would be nice to simply show/hide it based on spec + stance.
Add initial chi display

We should check if the ascendance talent has been learnt (and monitor
changes to it) in order to show/hide the fifth chi box and resize as
necessary.
Update rage + mana colours
Colour energy based on amount left
Update position of chi bar
Hide stagger bar out of combat
Make transparent and move player frame OOC