feat(websocket): Re-enable native SSL (MirrorNetworking#965)

* fix(websocket): Internal implementation fixes re-enabling SSL while retaining performance

* Catch normal exceptions if they occur

* Catch another WebSocket exception

* Make sure the stream still exists before we try to write to it

* fix(websocket): Only use the new sending technique if the stream is an SslStream

* fix(websocket): Use a better path generation strategy so a leading slash is not required

fix: SceneId was not set to 0 for prefab variants (MirrorNetworking#976…

…) (MirrorNetworking#977)

* fix: SceneId was not set to 0 for prefab variants (MirrorNetworking#976)

* Update NetworkIdentity.cs

perf: AddPlayerMessage is now a value type

perf: rpc messages are now value types (MirrorNetworking#997)

feat: support writing and reading array segments (MirrorNetworking#918)

* Unit tests for writing array segments

* Add tests back for ArraySegment<int>

* Work in progress trying to generate writer

* Avoid boxing

* Weaver can now generate readers and writers for ArraySegment<T>

* Added by accident

* Clarify the loop

* Explain method specializer

* Remove unused method

* Explain loop in reader

Folder is gone

perf: SceneMessage is now a value type (MirrorNetworking#989)

perf: empty messages are value types now

Revert "New Basic Example (MirrorNetworking#985)"

This reverts commit 66f7693.

fix: don't use obsolete method