Use aiohttp instead of websockets

[gbtami]

Because websockets has no MSYS2 package installing it in MSYS2 environment needs to install the full dev toolchain.
We should use aiohttp instead to make Windows install from sources simpler.
@ecrucru what do you think?

[ecrucru]

Hello. It should be feasible to analyze that with a reasonable effort. However, the new code base for the remote games relies on python-chess. If this package has the same issue, I suggest to drop the remote games in Pychess.

[gbtami]

Hmm. There is websocket usage in remotegames.py atm.

[ecrucru]

The current files are definitely obsolete. Instead, you may use this new adapted copy:
remotegame.py.txt

All the PyChess functions are replaced by chess.
websockets is replaced by aiohttp.
The detailed log and tests are removed.