Also move Lua scripts to share subfolder

scripts/s_foreach_track.lua

@@ -1,10 +0,0 @@
-ardour { ["type"] = "Snippet", name = "Foreach Track" }
-
-function factory () return function ()
-	for r in Session:get_tracks():iter() do
-		print (r:name())
-		-- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Track
-		-- for available methods e.g.
-		r:set_active (true, nil)
-	end
-end end