Multi-Component Sync Vars + Sync Vars in Children (#1503) * Support for multiple components of the same type on a Network Object to have sync vars. Adding support for children of a network object that aren't themselves network objects to have components with Sync vars too * Register and unregister Sync properties for child gos/comps appropriately * It goes here * Also unregister/register sync properties accordingly when GameObject id changes * NetworkMode can't be changed from NetworkMode.Object if we are actually a networked object (_net is valid) * Simplify a bunch - allow setting property if slot not registered * Remove unused UnregisterProperties methods * Add a test to make sure child sync vars are added to network table * Suppress these warnings for now - there are legitimate reasons why we might not find these GOs * Suppress unknown slot