Initial dump of BfA compatibility

Updated for:
- SPELL_POWER_* constants becoming Enum.PowerType.*
- Rank no longer existing in return values for UnitAura, UnitBuff, UnitDebuff, UnitCastingInfo, UnitChannelInfo
- UNIT_POWER event becoming UNIT_POWER_UPDATE
- UnitPopupFrames no longer existing
- Removed events: PLAYER_PET_CHANGED, UNIT_MAXPOWER, PET_BAR_CHANGED, UNIT_DYNAMIC_FLAGS
- Texture return value from UnitAura type changing (name -> id)
- All Warlock specializations using soul shards
- Death Knight rune changes

Haven't tested all classes/specializations yet, so I'm sure I missed some stuff.
Probably need to add support for the new circular cooldown wipe flourish added in the base client.
Saw a problem with cooldown flashes being delayed on DK runes becoming available that probably need to be fixed.

IceUnitBar.lua

@@ -19,6 +19,11 @@ IceUnitBar.prototype.hasPet = nil
 
 IceUnitBar.prototype.noFlash = nil
 
+local SPELL_POWER_INSANITY = SPELL_POWER_INSANITY
+if IceHUD.WowVer >= 80000 then
+	SPELL_POWER_INSANITY = Enum.PowerType.Insanity
+end
+
 -- Constructor --
 function IceUnitBar.prototype:init(name, unit)
 	IceUnitBar.super.prototype.init(self, name)