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If make -B is run, the rule is run with $? empty. Extract fron all file in
this case. But this gets fragile, really "make clean" should be used instead
with such build complexity.

When there're C files to be (re)compiled, they're all passed first to
preprocessor. QSTR references are extracted from preprocessed output and
split per original C file. Then all available qstr files (including those
generated previously) are catenated together. Only if the resulting content
has changed, the output file is written (causing almost global rebuild
to pick up potentially renumbered qstr's). Otherwise, it's not updated
to not cause spurious rebuilds. Related make rules are split to minimize
amount of commands executed in the interim case (when some C files were
updated, but no qstrs were changed).

A port which uses lib/utils/pyexec.c but which does not enable garbage
collection should not need to implement the gc_collect function.

This patch also moves the gc_collect call to after printing the qstr
info.  Since qstrs cannot be collected it should not make any difference
to the printed statistics.

There's no space for it.

Returns FlashROM size in bytes from vendor SDK's point of view, not
physical size.

Should be called to notify that current dupterm object has more input
data to read.

To use: .setsockopt(SOL_SOCKET, 20, lambda sock: print(sock)). There's a
single underlying callback slot. For normal sockets, it serves as data
received callback, for listening sockets - connection arrived callback.

By skipping loading site.py, etc.

This allows for better error messages, since the name of the file (sans
.py) can now be printed when an exception occurs within a frozen script.

Original patch was authored by Tobias Badertscher / @tobbad, but it was
reworked to split UART edits from USB edits.

L4 does not have UART6, and has similar registers to the F7.

Original patch was authored by Tobias Badertscher / @tobbad, but it was
reworked to split UART edits from USB edits.

64-bit integer division brings a dependency on library functions. It is
avoided here by dividing fck and baud by a common divisior.  The error
is the better (1/(2*0x300)) as with 64 bit division (1/(0x300)).

These files come from STM32Cube_FW_L4_V1.3.0, with Windows line endings
converted to unix.  Only basic HAL files are added.  In addition the QSPI
support is included to support later external QSPI flash as mass storage.

- any architecture may explicitely build with qstring make
  QSTR_AUTOGEN_DISABLE=1 autogeneration disabled and provide its
  own list of qstrings by the standard
  mechanisms (qstrdefsport.h).

Note this still needs some work: currently all source files are always
preprocessed no matter which one actually changed, moreover that happens
file by file without any parallellism so builds are painstakingly slow.

- add template rule that converts a specified source file into a qstring file

- add special rule for generating a central header that contains all
  extracted/autogenerated strings - defined by QSTR_DEFS_COLLECTED
  variable. Each platform appends a list of sources that may contain
  qstrings into a new build variable: SRC_QSTR. Any autogenerated
  prerequisities are should be appened to SRC_QSTR_AUTO_DEPS variable.

- remove most qstrings from py/qstrdefs, keep only qstrings that
  contain special characters - these cannot be easily detected in the
  sources without additional annotations

- remove most manual qstrdefs, use qstrdef autogen for: py, cc3200,
  stmhal, teensy, unix, windows, pic16bit:

   - remove all micropython generic qstrdefs except for the special strings that contain special characters (e.g. /,+,<,> etc.)
   - remove all port specific qstrdefs except for special strings
   - append sources for qstr generation in platform makefiles (SRC_QSTR)