Drop RunMacroText fallback and dead actionbar spellslot branches

ClassicAPI 1.18 provides RunMacroText natively; bump CAPI min to 1.18.0. spellslot/booktype/scanmacro were only ever cleared, never set.

modules/actionbar.lua

@@ -382,8 +382,6 @@ pfUI:RegisterModule("actionbar", function ()
       end
     elseif self.spellID then
       GameTooltip:SetSpellByID(self.spellID)
-    elseif self.spellslot and self.booktype then
-      GameTooltip:SetSpell(self.spellslot, self.booktype)
     else
       GameTooltip:SetAction(self.id)
     end
@@ -456,11 +454,6 @@ pfUI:RegisterModule("actionbar", function ()
       id = self.bar == 1 and self.slot or sid-((self.bar)-1)*12
     end
 
-    -- overwrite with spell macro texture where possible
-    if self.spellslot and self.booktype then
-      texture = GetSpellTexture(self.spellslot, self.booktype)
-    end
-
     if not self.showempty and self.backdrop and not texture and grid == 0 then
       self.backdrop:Hide()
       self.hide = true
@@ -590,9 +583,6 @@ pfUI:RegisterModule("actionbar", function ()
       start, duration, enable = GetShapeshiftFormCooldown(button.id)
     elseif button.bar == 12 then
       start, duration, enable = GetPetActionCooldown(button.id)
-    elseif button.spellslot and button.booktype then
-      start, duration = GetSpellCooldown(button.spellslot, button.booktype)
-      enable = 1
     else
       start, duration, enable = GetActionCooldown(button.id)
     end
@@ -1150,8 +1140,6 @@ pfUI:RegisterModule("actionbar", function ()
     f.count:SetJustifyH("RIGHT")
     f.count:SetJustifyV("BOTTOM")
 
-    f.scanmacro, f.spellslot, f.booktype = nil, nil, nil
-
     -- range glow color
     f.rangeColor = GetStringColorObject(C.bars.rangecolor)