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Test possible combinations of single and double quotes with escaped
quotes and parenthesis with and without function calls in REPL.

Covers: #1419

Escaped quotes are now recognised correctly in REPL when used
inside normal quotes.

Fixes: #1419

Follow the same format as other ports using the macro to include
the HAL header.

So far, no signature check is done (TODO).

Addresses issue #1466.

Useful to load native method libraries not loaded by VM (as happens on
Android).

Configurable with MICROPY_PY_BUILTINS_SLICE_ATTRS.  Disabled by default.

There is an issue sending 1 byte on the SPI bus using DMA, but it only
occurs when the transmit is done for the first time after initialising
the SPI and DMA peripherals.  All other cases (sending 2 or more bytes,
doing send_recv, doing recv first) work okay.  We sidestep this issue by
using polling (not DMA) for all 1 byte transfers.  This is fine because
a 1 byte transfer can't be interrupted and doesn't need the benefits of
DMA (and using polling for this case is more efficient).

Resolves #1456.

When creating constant mpz's, the length of the mpz must be exactly how
many digits are used (not allocated) otherwise these numbers are not
compatible with dynamically allocated numbers.

Addresses issue #1448.

Adds support for ussl module (which is experimental and not fully
implemented yet itself).

Use this to set the global optimisation value when executing the main
script (and all scripts it imports).