Add state machine #91
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So this is an initial implementation, the idea being to use bound function pointers to the Gui class based on the application state.
What will be needed going forward is a way to pass values back and forth between the Gui and the Application. This could be done in a number of ways, for example, building a
structto pass meta information back and forth.Will need to ponder over this a bit to come up with something clean that's easy enough to work with without also being difficult to maintain.