New features:
- Adds support for 2D mode:
- Control placement depth from the overlay
- Tool auto switches when editor is in 2D mode.
- Adds new palette overlay GUI.
- Adds thumbnail scale slider to both palette overlay and window.
- Adds per axis rotation selection to settings overlay.
- Adds object instance parenting field to mode settings overlay.
- Supports surface aligned rotation.
- Fixes not being able to place objects in empty space.
- Fallback height is adjustable via settings window.
- Settings window: Section titles renamed for clarity.
- Add 'Open Palette Overlay' button to mode settings overlay start menu.
- Add hierarchy collapser tool to easily squash cascading hierarchy's with one button press.