Adds a system for tooltips

[NancokPS2]

It is surprisingly difficult to find the position of text without direct access to TextSever RIDs (i tried for 3 days). So this will probably get reworked with Godot 4.3 which adds a method to do it for you.

This tooltip is a Node2D that when added to any Control node, will automatically display a tooltip in the direction opposite to the closest edge of the screen (can be forced to be a set direction) with text set on the Tooltip node.
It will use the parent's theme if it has any and no theme was defined on the tooltip yet. ~It also supports "sub tooltips" which cause yet another tooltip to spring from the original when a keyword is hovered with the mouse, explaining in further detail said keyword.~
Sub tooltips have been delayed until Godot 4.3

Tooltips can be "pinned" which prevents them from moving or dissapearing by pressing the middle mouse button by default.

Added tooltips to some stats in the stats menu, the shop UI and the shortcuts at the top left of the screen.

TODO:

• [x] Add tooltips to some UI nodes
• [x] Consider a component version that augments existing Labels