Rework application entry point

[whymarrh]

This PR does a few things:

• Rewrites the entry point to the control software to be a bit less awful
  • No longer uses command-line arguments
  • Removes incorrect error handling for #67
  • Reads environment variables to accept configuration, crashes if they are not set appropriately
  • Makes variable names a bit less awful
  • Remove usages of Log in preparation for its removal (refs #138)
• Renames the cli project to bin
• Adds a LM_DISABLE_GPS environment variable to disable the GPS and its configuration (closes #126)

[whymarrh]

This works well, :shipit: