* Tileset editor window appears with notes, buttons, tilesetproperties, etc.
* Introduces a skeleton and placeholder for TilesetDisplay.
* The text controls on the right aren't autosizing correctly, and they're too small
Midstream on #8 - sizing problems.
midstrean on #8 - sizers mostly fixed, still some min sizes to set
Resizing works as expected now and minimum sizes enforced, moved the buttons for #8
For #8 midstream, all resizing works as expected now
