Shadowed:
	- Added new event HealComm_GUIDDisappeared(event, guid) fires when a GUID goes "missing" either because they have an active hot and are outside visible range, they are a pet that was dismissed with hots on them or they left a group with heals on them
	- Went back and clarified/cleaned up some comments that were old or out of date
	- Fixed an error when PARTY_MEMBERS_CHANGED fired for players who were not a healer class
	- Fixed guidToUnit/guidToGroup being removed before parseHealEnd when sanity checking
	- Fixed index nil table error when a group is disbanded while zoning
	- Fixed GetCasterHealAmount() now returns nil if no healing is incoming
	- Fixed getRcord typo on line #1904
