Rework LibGroupTalents now also returns function returns additionally, add Spec Role triggers to load/generic/bt2, fix WeakAuras.GetRegion

- **WeakAuras.SpecForUnit(unit)** = Returns: `classFileName..spec`, `Dominant Tree`, `spent1`, `spent2`, `spent3`
- **WeakAuras.GetUnitRole(unit)** = Returns one of: `"melee"`, `"caster"`, `"healer"`, `"tank"`
- **WeakAuras.SpecRolePositionForUnit(unit)** = Returns: `Dominant Tree`, `spent1`, `spent2`, `spent3`
- **WeakAuras.CheckTalentForUnit(unit, talentId)** = Returns: `"Points spent"` in talent or `nil`
- **WeakAuras.CheckGlyphForUnit(unit, glyphId)** = Returns: `true` if the player has the glyph associated with `spellID` or `spellName`, we can only see the glyphs of players running `LibGroupTalents-1.0`

WeakAurasOptions/OptionsFrames/OptionsFrame.lua

@@ -507,7 +507,7 @@ function OptionsPrivate.CreateFrame()
   local awesomeWotlkButton
   if not WeakAuras.isAwesomeEnabled() then
     awesomeWotlkButton = addFooter("Awesome WotLK", [[Interface\AddOns\WeakAuras\Media\Textures\GitHub.tga]], "https://github.com/FrostAtom/awesome_wotlk/releases",
-                                    L["Unlock nameplate anchoring & units in WeakAuras with the awesome_wotlk client patch"])
+                                    L["Unlock nameplate anchoring & units in WeakAuras with the Awesome WotLK client patch"])
     awesomeWotlkButton:SetParent(tipFrame)
     awesomeWotlkButton:SetPoint("LEFT", changelogButton or thanksButton, "RIGHT", 10, 0)
   end