This is a library to provide PlayerMana()/PlayerManaMax() for the current/maximum mana, even in druids bear/cat form. In point of mana, classes can be divided into warrior/rogue, druid, and the others. Although most of you are only interested with the hidden mana status of druids, this includes all classes to be a library.
Functions are
* PlayerMana() returns the player's current mana.
* PlayerManaMax() returns the player's maximum mana.
Changes :
v2.2
* fix the old tricky GameTooltip-related bug.
v2.1
* fix the zero bug occurring at an instance or world change.
V2.0
* Change the name and the API.
