Implement Python 3 bindings, so wasm3 can be easily used from Python.

This is discussed a bit more in #456.

Currently, to copy off files from the fs is to 1. mount, 2. chattr, 3. chmod/chown, 4. copy files off. However, this is destructive to the fs (since it changes permissions/users). Instead, there should be a less invasive way to copy off files that doesn't mess with the underlying fs so that people can copy the fs and use it somewhere else.

I just found https://github.com/dalance/svlint and would be interested how it copes with the ibex code base.

I found two issues with breakpoints while playing around with timertool for #80.

1. Changing a breakpoint does not have an affect on a running program until it is paused and then restarted. Breakpoints are passed to the simulator thread as function arguments (which is definitely necessary), but that means changes to the UI do not affect the simulator until the threads is shut down and restarted.