Simulator keybindings

[LnnrtS]

Just used the simulator for the first time. Generally it's very easy to build and use and very useful to have.

What was not intuitive for me was the keybindings. I understand the logic for the current bindings but when just using it as a standalone application (with no encoder in mind), these bindings worked better for me

• Encoder press is Enter
• Backwards is Esc or at least Backspace
• Encoder right should be also Arrow Down and Encoder left should also be Arrow up
• For quitting one can just use Alt + F4

Apart from Esc we could also have both mappings in parallel by providing the vector of mappings instead of the fix struct (and the vector would searched for every event)