Environemnts module

[Yohe-Am]

A separate module responsible for:

• Maintaining the PATH strings and other exported environment variables from Ports
• Writing and maintaining the auto loaders
• Possibly, maintaining shims and aliases

More feature ideas:

• Support multiple environments per ghjk.ts providing commands to switch from one to the other.
  • Might provide a simple solution to the "multi-version support" feature.
  • Poetry's env command and python virtual environments are a great inspo for this.
  • Whichever environment is selected as default will be picked by the auto loaders
    • $ghjk/envs will contain directories for each environment including their loaders and shims
    • $ghjk/autoenvs will contain symlinks to the default $ghjk/envs entries for each ghjk.ts directory for the auto loaders