breaking: Removed old Unity 2018 / 2019_3 compiler defines (MirrorNet…

…working#3397)

- we only suppport Unity 2019.4.40 and later LTS releases.
BREAKING: Removed old 2018 / 2019 compiler defines

KcpClient: Tick/Incoming/Outgoing can now be overwritten (virtual)

fix: kcp2p V1.30 (MirrorNetworking#3391)

- fix: set send/recv buffer sizes directly instead of iterating to find the limit.
  fixes: MirrorNetworking#3390
- fix: server & client sockets are now always non-blocking to ensure main thread never
  blocks on socket.recv/send. Send() now also handles WouldBlock.
- fix: socket.Receive/From directly with non-blocking sockets and handle WouldBlock,
  instead of socket.Poll. faster, more obvious, and fixes Poll() looping forever while
  socket is in error state. fixes: MirrorNetworking#2733

gitignore .vscode

fix: NetworkBehaviour SyncVar uses netId lookup (MirrorNetworking#3386)

* fix: NetworkBehaviour SyncVar uses netId lookup

Not only types derived from NetworkBehaviour
Fixes MirrorNetworking#2939

* Update Assets/Mirror/Editor/Weaver/Extensions.cs

* Update Assets/Mirror/Editor/Weaver/Processors/NetworkBehaviourProcessor.cs

* Update Assets/Mirror/Editor/Weaver/Processors/SyncVarAttributeProcessor.cs

* Update Assets/Mirror/Editor/Weaver/Processors/SyncVarAttributeProcessor.cs

* Update Assets/Mirror/Editor/Weaver/Processors/SyncVarAttributeProcessor.cs

* Update Assets/Mirror/Editor/Weaver/Readers.cs

* Update Assets/Mirror/Editor/Weaver/Writers.cs

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Co-authored-by: mischa <[email protected]>

Revert "Semantic.yml - only master branch"

This reverts commit bb54f26.

perf: Use static generic class to cache message id (MirrorNetworking#…

…3381)

* perf: Use static generic class to cache message id

we can (ab)use c# generics to cache the message id in a static field
this is significantly faster than doing a runtime Dictionary lookup in my testing (16% thread cpu-> ~0.22% for 121 moving nts)
generic classes have separate static fields per type specification, so we can store things per-type there, exactly what we need!

* Obsolete NetworkMessages.GetId

* Update Assets/Mirror/Core/NetworkMessages.cs

* Copy comment from GetId up to the Id field

* wording

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Co-authored-by: MrGadget <[email protected]>

perf: Cache Stable Hashes (MirrorNetworking#3377)

* perf: Cache Stable Hashes
- Static dictionary of message hashes
- ResetStatics

* Added debug log for future debugging.

* Update Extensions.cs

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Co-authored-by: mischa <[email protected]>

Revert "main.yml - exclude Docs folder"

This reverts commit 1a3e440.

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