Generic way to change spim state

We need a generic way to change the SPIM instrument state.

The simplest way to do this would be to just change the config object value and then call some sort of `spim.apply_configuration()` function. Under the hood, the config object will know what was changed, and the spim object will scan through all the changes and then apply them in a safe way.

The changes needed here are to move all of the GUI calls that access spim components (tigerbox, frame grabber, etc) and reroute them to the GUI.