Add environment variable support for all commands

[mountaindude]

Passing parameters via command line options works well enough, but in some cases it is desirable to pass in parameters via environment variables instead.

Given the library ("Command") used for handling command line parameters and options, it is relatively easy to do this.

Prefix all env variables with CTRLQ_ to avoid conflicts with other tools.

Priority for options will be (lowest to highest)

1. Default values
2. Vales passed in via environment variables
3. Values passed in via command line options

[mountaindude]

Part of version 4.4