Detect whether VUMM is ran from a mod project folder

[paulhobbel]

VUMM's commands should be limited when running from a mod project folder. VUMM should be aware whether publish related commands or intall related commands should be available. Aka VUMM should be context aware

Example:

When in mod project folder:

• vumm publish
• vumm package

When not in mod project folder

• vumm install
• vumm uninstall

Related to #15