Raz Rotenberg

Added recipe for 'genv' and 'jupyterlab_genv'

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Checklist - [x] Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml". - [x] License file is packaged (see [here](https://github.com/conda-forge/staged-recipes/blob/5eddbd7fc9d1502169089da06c3688d9759be978/recipes/example/meta.yaml#L64-L73) for an example). - [x] Source is...

Support configuring gate value

6

Currently, gate is always 100%

[Here's](https://www.musicofsound.co.nz/zimages/KaossScalesBIG.jpg) an example for a list of scales that supporting them might be pretty easy.

* Parameter substitution is done differently for zsh * Using @ modifier to split strings - Added environment variable 'GENV_SHELL' (based on $SHELL) - Added helper function '_genv_get_env'