Patch 8.0.1/API changes

Battle for Azeroth alpha UI changes observations:
* https://github.com/Ellypse/wow-ui-source/wiki/Battle-for-Azeroth-alpha-UI-changes-observations
==New==
* New table.
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* New table.
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==Changes==
* , , and have been moved inside the new namespace.
* COMBAT_LOG_EVENT_UNFILTERED event no longer provides a loadout. should be used OnEvent to retrieve that info.
* now raises an error when trying to register an unknown event.
* no longer accepts a spell name as a filter. You can use the new instead, implemented in Lua.
* UNIT_POWER is now UNIT_POWER_UPDATE
* The limit on the number of chat channels that can be joined by the player has been increased from 10 to 20.
* C_Vignettes replaced by C_VignetteInfo
==Removals==
*"all map API was removed", including functions like or .
** has been removed. Use ("player") to get the current uiMapID for the player or WorldMapFrame:GetMapID() to get the uiMapID map currently displayed in the World Map Frame UI.
** has been removed. Use (uiMapID, unitToken) to get the position of the unit (only works for the player and party members).
* has been removed, use EJ_GetInstanceForMap(C_Map.GetBestMapForUnit("player")) instead to get the current instance ID.
* GLYPH_ADDED, GLYPH_REMOVED, and GLYPH_UPDATED have been removed.
* FindSpellOverrideNameByName, FindBaseSpellNameByName, and SearchGuildRecipes have been removed.
==Events==
====Added====
These events were added or initially documented in Blizzard API Documentation.
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====Removed====
These events were removed.
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==See also==
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