change(repl): Reset the hardware when entering REPL

This will make it easier for casual users to take first steps with the card10.

The downside is that it might hinder debugging scripts which were running, as for example all files of core 1 have been closed and potentially all references to other APIs are lost. I consider that acceptable though:

• I'm not sure if that is even a goal of the REPL.
• It is still possible to launch a script from inside the REPL and debug it afterwards.
• Scripts launched by pycard10 can still be "debugged" like before.

Closes #212 (closed)