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There were 2 bugs, now fixed by this patch:
- after deleting an element the len of the dict did not decrease by 1
- after deleting an element searching through the dict could lead to
  a seg fault due to there being an MP_OBJ_SENTINEL in the ordered array

This fixes unresolved references after [f1ea3bc7]

The renames are:
HAL_Delay -> mp_hal_delay_ms
sys_tick_udelay -> mp_hal_delay_us
sys_tick_get_microseconds -> mp_hal_ticks_us

And mp_hal_ticks_ms is added to provide the full set of timing functions.

Also, a separate HAL_Delay function is added which differs slightly from
mp_hal_delay_ms and is intended for use only by the ST HAL functions.

Render related constants grouped together, with common description.

Also comes with a test for this.  Fixes issue #2904.

User can override PYTHON executable before running script,
gen-cpydiff.py works only with Python3 and most systems register
its executable as 'python3'.

TODO: Remove WiPy-specific chunks.

For the standard unix x86_64 build, this saves 11 bytes on object file
level, but no difference in executable size due to (bloaty) code alignment.

In this case, raise an exception without a message.

This would allow to shove few code bytes comparing to currently used
mp_raise_msg(..., "") pattern. (Actual savings depend on function code
alignment used by a particular platform.)

In MicroPython, the path separator is guaranteed to be "/", extra unneeded
things take precious code space (in the port which doesn't have basic things
like floating-port support).

The parser was originally written to work without raising any exceptions
and instead return an error value to the caller.  But it's now required
that a call to the parser be wrapped in an nlr handler, so we may as well
make use of that fact and simplify the parser so that it doesn't need to
keep track of any memory errors that it had.  The parser anyway explicitly
raises an exception at the end if there was an error.

This patch simplifies the parser by letting the underlying memory
allocation functions raise an exception if they fail to allocate any
memory.  And if there is an error parsing the "<id> = const(<val>)" pattern
then that also raises an exception right away instead of trying to recover
gracefully and then raise.

Previous to this patch any non-interned str/bytes objects would create a
special parse node that held a copy of the str/bytes data.  Then in the
compiler this data would be turned into a str/bytes object.  This actually
lead to 2 copies of the data, one in the parse node and one in the object.
The parse node's copy of the data would be freed at the end of the compile
stage but nevertheless it meant that the peak memory usage of the
parse/compile stage was higher than it needed to be (by an amount equal to
the number of bytes in all the non-interned str/bytes objects).

This patch changes the behaviour so that str/bytes objects are created
directly in the parser and the object stored in a const-object parse node
(which already exists for bignum, float and complex const objects).  This
reduces peak RAM usage of the parse/compile stage, simplifies the parser
and compiler, and reduces code size by about 170 bytes on Thumb2 archs,
and by about 300 bytes on Xtensa archs.

This patch allows uPy consts to be bignums, eg:

    X = const(1 << 100)

The infrastructure for consts to be a bignum (rather than restricted to
small integers) has been in place for a while, ever since constant folding
was upgraded to allow bignums.  It just required a small change (in this
patch) to enable it.

socket.timeout is a subclass of OSError, and using the latter is more
efficient than having a dedicated class.  The argument of OSError is
ETIMEDOUT so the error can be distinguished from other kinds of
OSErrors.  This follows how the esp8266 port does it.

Some compilers can't analyse the code to determine that these variables
are always set before being used.

Since we recently replaced the OSError string messages with simple error
codes, having the uerrno module gets back some user friendly error
messages.  The total code size (after removing strings, replacing with
uerrno module) is decreased.

It's configurable by defining MICROPY_PY_UERRNO_LIST.  If this is not
defined then a default is provided.

It's configured by MICROPY_PY_UERRNO_ERRORCODE and enabled by default
(since that's the behaviour before this patch).

Without this dict the lookup of errno codes to strings must use the
uerrno module itself.

It saves about 400 bytes of code space because the functions can now be
inlined.

Fixes issues #2880 and #2881.