Add more preset selections to Plug

Gone back to Ubuntu laptop and started editing the code.
The original Plug software allows to call 8 presets using Keyboard shortcuts.
I added 16 more presets and 16 Keyboard shortcuts.

Then I though it could be better define 24 presets while using only 8 Key shortcuts. 
I added 2 Key shortcuts, 'bank UP' and 'bank DOWN'. 
When bank value is 1, presets Key shortcuts allow to select presets 1...8.
When bank value is 2, presets Key shortcuts allow to select presets 9...16.
When bank value is 3, presets Key shortcuts allow to select presets 17...24.
When bank value is 3, pressing 'bank UP' will change bank value to 1.
When bank value is 1, pressing 'bank DOWN'' will change bank value to 3.

Now I can add instructions to select presets and change bank using some footswitches connected to Raspberry GPIO pins.  



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