Entity browser needs a refactor

[snake-biscuits]

Still in a very prototypey structure, breaking each tab into their own class will be handy for relocating these tabs throughout the UI

this could even lead to a design paradigm similar to blender’s UI panels system Linking a global scope to UI elements linked to that scope, updating visually to match the active selection

an outliner and a “logic nodes” panel would be quite useful, and thinking about things in this way could really help lock the UI down into something more easily understood