fix: register prefab error with same guid (MirrorNetworking#2092)

* tests for when newassetId is same as current

* stopping error if ids are the same

* invert if and adding comment

 fix: renaming call/invoke prefix for SyncEvent (MirrorNetworking#2089)

* renaming sync event

same reason as MirrorNetworking#2088

* removing un-used const

feat: Rigidbody example (MirrorNetworking#2076)

* adding example for NetworkRigidbody

* adding hud

* adding empty player so that scene objects spawn

* turning off debug logs

feat: Sync Events no longer need Event prefix (MirrorNetworking#2087)

Instead of doing
```cs
[SyncEvent]
public event MySyncEventDelegate EventOnly;
```

You can now do
```cs
[SyncEvent]
public event MySyncEventDelegate Only;
```

We actually tried to remove them a while ago. The way the weaver worked
back then caused an infinite recursion.

Since the Command rewrite that allows virtuals, this is no longer
a problem.  So we can drop this requirement.

Co-authored-by: Paul Pacheco <[email protected]>

feat: ClientRpc no longer need Rpc prefix (MirrorNetworking#2086)

Instead of doing
```cs
[ClientRpc]
public void RpcPepe() {}
```

You can now do
```cs
[ClientRpc]
public void Pepe() {}
```

We actually tried to remove them a while ago. The way the weaver worked
back then caused an infinite recursion.

Since the Command rewrite that allows virtuals, this is no longer
a problem.  So we can drop this requirement.

Co-authored-by: Paul Pacheco <[email protected]>

fix: not removing server if id is empty (MirrorNetworking#2078)

* logging error message

* not removing server if ID is empty

tests for struct message with empty function (MirrorNetworking#2067)

perf: Use invokeRepeating instead of Update (MirrorNetworking#2066)

* perf: Use invokeRepeating instead of Update

If you have low frequency calls, InvokeRepeating is a lot faster than
Update().  Use InvokeRepeating for NetworkProximityChecker

* Fix indentation

Co-authored-by: Paul Pacheco <[email protected]>

fix: weaver now processes multiple SyncEvent per class (MirrorNetwork…

…ing#2055)

* weaver test for mutlitple events

* tests for multiple sync events in 1 class

* removing break so that multiple events will be proccessed

It seems like this break was here because unet used foreach CustomAttributes
but mirror uses GetCustomAttribute

fix: If socket is undefined it will return false. See MirrorNetworkin…

…g#1486 (MirrorNetworking#2017)