Cannot live-sync

[LPGhatguy]

Right now, the game can only be built to a place file. The Rojo plugin trips over a few different things when trying to live sync. This isn't so bad, but hurts iteration speed.

Main blockers:

• [ ] rbx_xml brings in nonsense properties like Model.ModelInPrimary. This will be fixed when Rojo upgrades to the latest rbx-dom
• [ ] Some property types still can't be synced, like tags. This will be fixed when the Rojo plugin ports to use rbx_dom_lua