fixed klighd action execution to not care about selectability, but for action defintion as in its Piccolo counterpart.

[NiklasRentzCAU]

Make scaled up title renderings click-through if no actions are defined on that rendering. Fixes #90. This does not replicate the Piccolo behavior 100%, as there action execution is handled front-to-back on the canvas, we here do the execution child-to-parents, which is not necessarily the same.