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Move webrepl support code from ports/esp8266/modules into extmod/webrepl
(to be alongside extmod/modwebrepl.c), and use frozen manifests to include
it in the build on esp8266 and esp32.

A small modification is made to webrepl.py to make it work on non-ESP
ports, i.e. don't call dupterm_notify if not available.

This is an ESP32-specific peripheral so lives in the esp32 module.

This is an alternative to f4ed2dfa that adds a newline so that the output of
the test starts on a new line and the result of the test is prefixed with
"result: " to distinguish it from the test output.

Suggested-by: @dpgeorge

This reverts commit f4ed2dfa.

This lets tinytest work as it was originally designed.  An alternate
solution for the reverted commit will be implemented in a future commit.

Including information about .mpy versioning and how to debug failed imports
of .mpy files.

This patch allows executing .mpy files (including native ones) directly on
a target, eg a board over a serial connection.  So there's no need to copy
the file to its filesystem to test it.

For example:

    $ mpy-cross foo.py
    $ pyboard.py foo.mpy

- Corrected pin assignments and checked with CubeMX.
- Added additional I2C and UARTs.
- Added Ethernet interface definitions with lwIP and SSL support (but
  Ethernet is currently unsupported on H7 MCUs so not fully enabled).

- Removed remarks on DFU/OCD in mpconfigboard.h because deploy-stlink works
  fine too.
- Added more UARTs, I2C, corrected SPI, CAN, etc; verified against CubeMX.
- Adapted pins.csv to remove errors, add omissions, etc. according to
  NUCLEO-144 User Manual.
- Changed linker file stm32f767.ld to reflect correct size of the Flash.
- Tested with LAN and SD card.

The Nucleo board does not have an SD card slot but does have the requisite
pins next to each other and labelled, so provide the configuration for
convenience.

This example will now work on all ports with networking and ssl support,
with both axtls and mbedtls.

This makes sure tinytest.o is rebuilt if any of its dependencies change.

This makes the loading of viper-code-with-relocations a bit neater and
easier to understand, by treating the rodata/bss like a special object to
be loaded into the constant table (which is how it behaves).

See issues #3220 and #3710.

So accessing the seek offset (at the C level) doesn't cause an
OverflowError on 32-bit targets.

Because MICROPY_ALLOC_PATH_MAX is only 128 for this port.

Because CPython 3.8.0 now produces different output:
- basics/parser.py: CPython does not allow '\\\n' as input.
- import/import_override: CPython imports _io.

Because in network_wiznet5k the TX/RX buffers are set to 16k each when in
MACRAW mode, which is used with lwIP.

Enabling WIZCHIP_USE_MAX_BUFFER will make the TX/RX buffers the maximum
available size, for use with MACRAW mode.