Make the plugin "release-able"

[hello-adam]

The fundamentals of this plugin work, but a few things need to be solidified:

• The way that the BitContainer is updated could probably be a lot less aggressive. Loading the entire file when things change is probably best. The internal hobbits swapping/caching will make gigantic files manageable. The worst case scenario is a large file that keeps changing because BitContainers don't currently support spot edits.

• It shouldn't update when the widget is in the background or closed (see RefreshDeferrer and createRefreshDeferrer)

• style/theme cleanup - make sure fonts and colors are synced to whatever degree is possible with the way hobbits displays render. This will be very imperfect.

• Create a guide for building and loading into Cutter

This project/issue can replace the hobbits-cutter-plugin conversation in rizinorg/cutter-plugins#3 and Mahlet-Inc/hobbits#9

I've mentioned this before, but I'd happily advise/support anyone who wanted to work on this - I can only work on it during downtime, and I am barely familiar with radare2/Cutter from a user perspective.