Also move Lua scripts to share subfolder

share/scripts/_export_tracks.lua

@@ -0,0 +1,10 @@
+ardour { ["type"] = "Snippet", name = "Export Track XML" }
+
+function factory () return function ()
+	local rlp = ARDOUR.RouteListPtr ()
+	local sel = Editor:get_selection ()
+	for r in sel.tracks:routelist ():iter () do
+		rlp:push_back (r)
+	end
+	print (Session:export_track_state (rlp, "/tmp/rexport"))
+end end