limited restart capability, not enough

[sfinktah]

Having managed to crash another IPython session, (this time due to ZMQ running out of file handles), it is becoming increasingly annoying not to be able to restart IPyIDA.

I made this small alterations in the hope of being able to do so, but alas this limited form of shutdown and restart doesn't even reload the color scheme. Worse, output from print no longer appears in the IPython window after the plugin has been restarted (though it seems otherwise fine).

It is however a step in the right direction.