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After this you need only one path for build (path/to/djgpp/bin). Original patch made by @dhylands

Addresses issue #1972.

The docs are still heavily biased towards WiPy, so will need a lot of
exclusions.

SOF irqs are now standard for rx/tx USB transfers, so enable them for both
FS and HS modes.  Fixes #1944.

Addresses issue #1965.

Because different emitters need to handle with-cleanup in different ways.

Adds 2k to the code size.

Currently UART(0) and UART(1) are exposed and only uart.write works.

Use esp.osdebug(None) to disable, or esp.osdebug(uart_id) to send output
to a UART.

mp_fun_kw_t takes mp_map_t* (and not const mp_map_t*) to ease passing
this arg to mp_map_lookup(), which may modify its arg, depending on
flags.

With gap between segments minimized, there's not much padding to flash,
so no big speed overhead.

With .rodata being in FlashROM now, gap can be much smaller now. InstRAM
can be max 32K, and with segment headers, that already makes it more than
32K. Then there's some .data still, and the next Flash page boundary is
0x9000. That figure should be more or less future-proof.

TODO: Refactor makeimg to take FlashROM segment offset from file name.

Needed for frozen scripts, and for future growth of binary.

This is helpful when running on deeply embedded targets, but may be
"security risk". Caveat emptor.