Added checks for rune count changing mid-session

Right now most ClassPowerCounter child classes are doing this work themselves, but they don't need to be. Some cleanup could be done there if anyone ever felt like doing it. (I did a tiny bit with Shards and Chi, but there's more to be done)

modules/ClassPowerCounter.lua

@@ -17,6 +17,7 @@ IceClassPowerCounter.prototype.DesiredAnimPause = 0.5
 IceClassPowerCounter.prototype.requiredSpec = nil
 IceClassPowerCounter.prototype.shouldShowUnmodified = false
 IceClassPowerCounter.prototype.unmodifiedMaxPerRune = 10
+IceClassPowerCounter.prototype.unit = "player"
 
 IceClassPowerCounter.prototype.growModes = { width = 1, height = 2 }
 IceClassPowerCounter.prototype.currentGrowMode = nil
@@ -418,6 +419,9 @@ end
 function IceClassPowerCounter.prototype:Enable(core)
 	IceClassPowerCounter.super.prototype.Enable(self, core)
 
+	self.numRunes = UnitPowerMax(self.unit, self.unitPower)
+	self:CreateFrame()
+
 	self:CheckValidLevel(nil, UnitLevel("player"))
 end
 
@@ -483,6 +487,12 @@ function IceClassPowerCounter.prototype:UpdateRunePower(event, arg1, arg2)
 		return
 	end
 
+	local numMax = UnitPowerMax(self.unit, self.unitPower)
+	if numMax ~= self.numRunes then
+		self.numRunes = numMax
+		CreateFrame()
+	end
+
 	local numReady = UnitPower("player", self.unitPower)
 	local percentReady = self.shouldShowUnmodified and (UnitPower("player", self.unitPower, true) / self.unmodifiedMaxPerRune) or numReady