Two terminal support

[neelabhg]

This follows from our discussion with @ysangkok at cs-education/sysbuild#17. I thought this is a better place to bring this up.

We are using a fork of jor1k in cs-education/sysbuild, a programming learning tool.
For our tool, we had enabled and implemented a second terminal using tty1. The way it is currently done is that a modified version of jor1k-master (jor1kGUI) is being used. However, with the new refactoring of jor1k, it is hard to make our modifications in an extensible way. Anyway, any modifications should be part of the jor1k project itself. A major problem in updating our fork of jor1k to the latest version is that the latest version does not support two terminals (tty0 is hard-coded in MackeTerm, for example).

See issue cs-education/sysbuild#19 and pull-request cs-education/sysbuild#56 for how two terminals were implemented in our project.

[neelabhg]

Closed in pull request #63.