Deprecate the project

[ForNeVeR]

I have multiple reasons for that:

1. The state of the code base is far from ideal: there're multiple known race conditions (Deadlock #95, Jabber response is not delivered to recipient if sendnig thread is the same that was listened before #99) that are very hard to reproduce and fix. Additional challenge would be fixing them without breaking the existing API.
2. I have very little free resources to maintain such a huge library (including the Windows Forms support, .NET Core-unfriendly code etc. etc.)
3. I personally have little trust to copyleft licenses (even LGPLv3), and Jabber-Net, unfortunately, uses such license.

Sorry, everyone, but I give up on any efforts to drive the project forward. If someone else wants to maintain the project, I may transfer it or provide a helping hand.

Feel free to contact me if you're interested in project maintainership.