Clean up WeakAuras table and remove members that no one should touch

WeakAuras/Init.lua

@@ -1,7 +1,7 @@
 local AddonName, Private = ...
 WeakAuras = {}
 WeakAuras.L = {}
-WeakAuras.frames = {}
+Private.frames = {}
 
 WeakAuras.normalWidth = 1.3
 WeakAuras.halfWidth = WeakAuras.normalWidth / 2
@@ -117,6 +117,8 @@ end
 function Private.StopProfileUID()
 end
 
+Private.ExecEnv = {}
+
 -- If WeakAuras shuts down due to being installed on the wrong target, keep the bindings from erroring
 function WeakAuras.StartProfile()
 end