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Constant folding in the parser can now operate on big ints, whatever
their representation.  This is now possible because the parser can create
parse nodes holding arbitrary objects.  For the case of small ints the
folding is still efficient in RAM because the folded small int is stored
inplace in the parse node.

Adds 48 bytes to code size on Thumb2 architecture.  Helps reduce heap
usage because more constants can be computed at compile time, leading to
a smaller parse tree, and most importantly means that the constants don't
have to be computed at runtime (perhaps more than once).  Parser will now
be a little slower when folding due to calls to runtime to do the
arithmetic.

This function returns the sign (-1, 0 or 1) of the integer object.

Before this patch, (x+y)*z would be parsed to a tree that contained a
redundant identity parse node corresponding to the parenthesis.  With
this patch such nodes are optimised away, which reduces memory
requirements for expressions with parenthesis, and simplifies the
compiler because it doesn't need to handle this identity case.

A parenthesis parse node is still needed for tuples.

Handles, eg, "{:>20}".format("foo"), where there is no explicit spec for
the type of the argument.

Note that even though wrapped in MICROPY_CPYTHON_COMPAT, it is not
fully compatible because the modifications to the dictionary do not
propagate to the actual instance members.

Only types whose iterator instances still fit in 4 machine words have
been changed to use the polymorphic iterator.

Reduces Thumb2 arch code size by 264 bytes.

The traceback array stores qstrs and line numbers.  qstrs are typed as
size_t, and line numbers should safely fit in size_t as well.

So that if MICROPY_FORCE_32BIT is set mpconfigport.mk it influences
mkenv.mk.

Function to actually spool output terminal data to dupterm object.

To comply with already established scheme for extmod's.

That's just function which sets/gets dup terminal object, and can be
easily reused across ports.

To allow simple zero-terminated lexers.

This makes the code portable to non-32-bit architectures.

The USB REPL has been broken since commit 1be0fde4
This patch allows the STM32F429DISC board (which uses the USB_HS PHY)

It's possible to have a fixed map that is properly hashed (ie not
simply ordered).

Any fields changed by asynchronous callbacks must be volatile.