Socket fixes

[mokolotron]

• Add async slave order execute. (I'm never before working with python asyncio, so need review this commit ) and say was this a right way or not
• Market orders are working again
• Fixed sell order execution.
• Fixed stop button.

Next step will be adding error handling. If you have any suggestions or corrections in the code - you are welcome

[MohammedRashad]

I reviewed the commit you referenced and the rest. all looks good to me.

Thanks for your contribution and keeping this project alive. What do you think about making tests for the next version?