Fixes#1749
Defining a global true `bool core1_separate_stack = true` will separate
the two cores' stacks, with core 0 using the scratch RAM while core 1
will use 8K from the heap.
Move the Joystick, Keyboard, and Mouse into a base class which handles
the operation/input, and a subclass which will implement the reporting
as a HID device via USB, Bluetooth Classic, or Bluetooth Low Energy (BLE).
Reduce copies of library code and makes maintainability much better.