Added default blender meshes.
Various changes:

* Updated jsons.
* Engine loads cone json.
* Maximizing window only requires hovering over it.
* Removed docs functonality section.
* Removed plane object.
* Added reticle physics.
* Modified new window placement.
* Currently, desktop loads 4 desktops.
Added openbox method to desktop.
Made json a top-level folder and added character models.