Daily Monetaries + Tooltips

Added a general purpose tooltip scene for instancing with the _make_custom_tooltip() method. That was a pain to get right - I spent a good half hour trying to figure out why it wouldn’t work before realizing the root had to be a container node. Control nodes stink and I hate them.

In practical terms, I’ve added a method to append daily costs and profits to the ledger interface. Nothing actually uses it yet, so the values in here are from a debug keybind I was using.