Moved the configuration into a load-on-demand addon.
Monk: merged the Mistweaver plugin into base monk rules.

There is almost no gain to keep it separated.
Display: use a pool and a factory to manage flash overlays.
Display: add a new feedback: "hint".

Used for suggestions.
Do not show out of combat or when the spell is on cooldown.
Monk: display hints for Mana Tea, Renewing Mist, Thunder Focus Tea and Uplift.