Remove Mirror from this repository?

[joekaapa]

I'd suggest considering the removal of Mirror from this repository. The reasons are primarily:

-Mirror can be easily imported to Unity by using its more often updated and maintained release packages
-Every Mirror version update in LiteNetLib4Mirror will always include the Mirror version changes. This is not ideal when comparing changed files. In addition, the original Mirror commits are anyways lost in this repository.

Are there any real drawbacks except the need for importing two packages in Unity?

By also adopting #17, it shouldn't be too hard to manually fetch and use correct Mirror releases.