Improve Event Transpiler Helpers

[dhkatz]

Improving the event transpiling/patching system a bit

Fixed the following issues:

• Classes annotated with multiple EventPatch attributes were getting their patches applied twice with dynamic patching
• EventTranspilerInjector.InjectDeniableEvent was generating the wrong IL code for the existing player events
  • Broke up the method into internal sub methods (planned to be used for CodeMatcher extensions as well
  • Properly copy labels onto new instruction so branching is preserved
• The CriticallyInjure and Healing events were not being transpiled correctly
  • They now emit correctly when being critically injured and healed back from critical

Event Example

Given the following handlers:

        Events.Handlers.Player.CriticallyInjure += @event =>
        {
            Log.Info($"Player {@event.Player.playerUsername} is being critically injured.");
            Log.Info($"Health: {@event.Player.health}");
        };
        Events.Handlers.Player.Healing += @event =>
        {
            Log.Info($"Player {@event.Player.playerUsername} is being healed.");
            Log.Info($"Health: {@event.Player.health}");
        };

We see the following output when taking damage which drops health below 10:

[11/18/2023 1:54 AM (08.339s)] [Info] [LethalAPI.Core] Player dhkatz is being critically injured.
[11/18/2023 1:54 AM (08.342s)] [Info] [LethalAPI.Core] Health: 5

After waiting a bit we are healed back up to 20 and are no longer critically injured:

[11/18/2023 1:54 AM (22.575s)] [Info] [LethalAPI.Core] Player dhkatz is being healed.
[11/18/2023 1:54 AM (22.579s)] [Info] [LethalAPI.Core] Health: 20