Bump to version 0.5.0

Added MANIFEST.in for setuptools and moved the scripts folder to coso…

…lvkit/cli to allow conda package building

Completely removed python version restrictions.

Fixed error in importing cosolvkit with python3.9

Updated to openmmforcefields 0.13 and espaloma 0.3.2

bumped version 0.4.3

Created readthedocs documentation. Changed the format of docstrings, …

…cleaned the code and updated python dependencies. Bump to version 0.4.2

Changed version to 0.4.1

version used for PLpro simulations