Add support for using ssh config file for connections

[kevinCDW]

While using wave terminal, you have to set up the details of each connection in the interface. If you've already defined the connections in your ~/.ssh/config file, they have to be reentered.
Would be a great feature to have it already fill out the connections(could be opt in too) with what is in the ssh config file.

[oneirocosm]

I will be adding more features to this in the future, but the basic functionality is present in v0.7.0