Merge classicapi-next: friend list and spell fields on ClassicAPI

Squashed from the classicapi-next branch:
- Read spell fields through ClassicAPI instead of nampower (libdebuff, swingtimer)
- Read friend and who-list class tokens from C_FriendList (socialmod, libunitscan)
- Count online friends with C_FriendList.GetNumOnlineFriends
- Add a friend notes module (modules/friendnotes.lua)
- Bump ClassicAPI minimum version to 10906

libs/libdebuff.lua

@@ -376,11 +376,9 @@ local function GetDebuffSlotMap(guid)
       local texture = libdebuff:GetSpellIcon(spellId)
       local stacks = (auraApps and auraApps[auraSlot] or 0) + 1
       local dtype = nil
-      if GetSpellRecField then
-        local dispelId = GetSpellRecField(spellId, "dispel")
-        if dispelId and dispelId > 0 then
-          dtype = dispelTypeMap[dispelId]
-        end
+      local dispelId = C_Spell.GetSpellDispelType(spellId)
+      if dispelId and dispelId > 0 then
+        dtype = dispelTypeMap[dispelId]
       end
       map[displaySlot] = {
         auraSlot = auraSlot,