[Feature Request] Save also current python virtual environment in config file with SaveUserSessionLayout plugin

[markdoerr]

Is your feature request related to a problem? Please describe.
Currently in the "SaveUserSessionLayout" (PR #878 ) only the current directory is stored in the config file.
It would be nice to also add the current active virtual environments - and restore them later on (maybe through the 'command' attribute in the config file.

Describe the solution you'd like
If a terminal is using a virtual environment, also save it to the session config file.
Use this config information to re-activate the virtual environment on session restore.