Merge remote-tracking branch 'adafruit/2.x' into merge_2x

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-Stack push and pop
-==================
-
-Document conventions
---------------------
-
-The ``push()`` and ``pop()`` instructions accept as their argument a register set containing
-a subset, or possibly all, of the general-purpose registers R0-R12 and the link register (lr or R14).
-As with any Python set the order in which the registers are specified is immaterial. Thus the
-in the following example the pop() instruction would restore R1, R7 and R8 to their contents prior
-to the push():
-
-* push({r1, r8, r7}) Save three registers on the stack.
-* pop({r7, r1, r8}) Restore them
-
-Stack operations
-----------------
-
-* push({regset}) Push a set of registers onto the stack
-* pop({regset}) Restore a set of registers from the stack