This fixes an issue where ConnectionModeScript and/or StatsDisplay would throw an exception if certain optional properties were not defined.

Minor adjustment to the Spawner class where if the frequency of spawning is set to zero it will only spawn 1 instance (i.e. a one shot spawner).

Updated several samples to use UnityTransport as opposed to UNet.
Limited number of objects spawned, adjusted the ray cast line renderer, updated the physics player to have a ray pointing towards its forward (to know the direction you are going) in physics example.
Adjusted the connect mode buttons so they will automatically re-appear when you disconnect.
Updated several projects to have their own network prefab list.
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whitespace removal