Add an [Networked(<targets>)] attribute

[orels1]

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Feature Description: As a continuation of this it would be nice to have some sort of [Networked] attribute to use in your U# code. This will mean that we can use a C#-like style of invoking events while still keeping them networked, as right now we have to use SendCustomNetworkEvent.

Additional context: Examples of usage would be

[Networked] // Target implicitly set to All
public void Bonk() {}

[Networked(All)] // Target explicitly set to All
public void Bonk() {}

Since we can define parameters for U# methods, this will also need to check for those and drop an error if you're trying to define a networked method with a parameter. But I think its a fair tradeoff for nicer code style and better refactoring support.

[MerlinVR]

This is mostly waiting on VRC to better define what they are going to be doing with network events for what targets they'll be able to have, if/how they'll support parameters, how or if network events will be protected from "malicious" events sent by modified clients, etc.

[owlboy]

how or if network events will be protected from "malicious" events sent by modified clients, etc.

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