Eliminate Caldera Core Dependencies on Plugins: manx

[scmessick]

What problem are you trying to solve? Please describe.
Currently, in order to use Caldera certain plugins are required for Caldera to function. Ideally, Caldera should not have any dependies on plugins for basic functionality. For the manx plugin, Caldera requires in app/contacts/contact_tcp.py the Session class from the manx plugin (manx/app/c_session.py). Should probably consider moving the Session class to Caldera core

The ideal solution: What should the feature should do?
Move class to Caldera core

What category of feature is this?

• UI/UX

• API

• Other

• Willing to submit a pull request to implement this feature?

[github-actions]

Looks like your first issue -- we aim to respond to issues as quickly as possible. In the meantime, check out our documentation here: http://caldera.readthedocs.io/