Pyshortcuts

more updates and tests

many more fixes between 1.9.2, especially for Windows

restore exporting `get_desktop()` function.

* add sphinx documentation
* add several utility functions, mostly as this is a lightweight package that can host useful Python-only utilities.

* add -x argument to command-line and 'noexe' function arg to have no exe: script is the full path of the script to execute
* for anaconda on Windows: envrunner script looks for and uses either Scripts\activate or condabin\conda activate
* several typos

* remove special code for Anaconda-on-macos with documentation on how to fix wxPython code to run properly
* adds support for shortcuts to single-line python commands such as `'{sys.executable} -m pip install --upgrade <package_name>'`, by allowing `_` or `{}` at the beginning of a script to mean "use the current Python`. An example is included.
* add support for Python 3.11, drop support for Python 3.7