Enhance GPIO to allow use in non-templated classes and variables #14
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Defines a pure virtual base class IGPIO from which the hardware-specific GPIO classes are derived. This allows references to IGPIO objects to be passed to non-templated class constructors and methods and allows class and other variables to be IGPIO methods without the use of templates.
Since none of the methods of the GPIO classes modify any class attributes I added const declarations throughout.
Neither the size or speed of the native hardware-specific GPIO classes are affected.
I added new benchmark methods to demonstrate the performance of the wrapped objects.