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The lexer constructor may now raise an exception and it needs to be caught.

And raise an exception when mp_lexer_new_from_file is called.

And raise an exception when mp_lexer_new_from_file is called.

And raise an exception when mp_lexer_new_from_file is called.

And raise an exception when mp_lexer_new_from_file is called.

The lexer can now raise an exception on construction so it must go within
an nlr handler block.

The lexer can now raise an exception on construction so it must go within
an nlr handler block.

This patch refactors the error handling in the lexer, to simplify it (ie
reduce code size).

A long time ago, when the lexer/parser/compiler were first written, the
lexer and parser were designed so they didn't use exceptions (ie nlr) to
report errors but rather returned an error code.  Over time that has
gradually changed, the parser in particular has more and more ways of
raising exceptions.  Also, the lexer never really handled all errors without
raising, eg there were some memory errors which could raise an exception
(and in these rare cases one would get a fatal nlr-not-handled fault).

This patch accepts the fact that the lexer can raise exceptions in some
cases and allows it to raise exceptions to handle all its errors, which are
for the most part just out-of-memory errors during construction of the
lexer.  This makes the lexer a bit simpler, and also the persistent code
stuff is simplified.

What this means for users of the lexer is that calls to it must be wrapped
in a nlr handler.  But all uses of the lexer already have such an nlr
handler for the parser (and compiler) so that doesn't put any extra burden
on the callers.

For example, if the current directory is the root dir then this patch
allows one to do uos.listdir('mnt'), where 'mnt' is a valid mount point.
Previous to this patch such a thing would not work, on needed to do
uos.listdir('/mnt') instead.

Some ports may want to compile with generic MICROPY_VFS support but without
the VfsFat class.  This patch allows such a thing.

Minimal config can be now build with:

./make-minimal BOARD=...

This is required because of Makefile.exports magic, which in its turn depends
on PROJ_CONF to be set correctly at the beginning of Makefile parsing at all
times. Instead of adding more and more workarounds for that, it's better to
just move minimal support to a separate wrapper.

Also, remove Zephyr 1.5 era cruft from Makefile, and add support for Zephyr's
"run" target which supercedes older "qemu" target in upstream.

This is a typical problem with make: we want to trigger rebuilds only
if file actually changed, not if its timestamp changed. In this case,
it's aggravated by the fact that prj.conf depends on the value of
BOARD variable, so we need to do some tricks anyway. We still don't
try to detect if just BOARD changed, just try to generate new
prj.conf.tmp every time (quick), but do actual replacement of prj.conf
only if its content changed.

This is so that the filename of the test doesn't clash with the module name
itself (being "websocket"), and lead to potential problems executing the
test.

MICROPY_LONGINT_IMPL_LONGLONG doesn't have overflow detection, so just
parsing a large number won't give an error, we need to print it out
to check that the whole number was parsed.

This makes int.from_bytes() work for MICROPY_LONGINT_IMPL_LONGLONG.

These short unit tests test the base uPy methods as well as parts of the
websocket protocol, as implemented by uPy.

@dpgeorge converted the original socket based tests by @hosaka to ones
that only require io.BytesIO.

This test just tests that the basic functions/methods can be called with
the appropriate arguments.  There is no real test of underlying
functionality.

Thanks to @hosaka for the initial implementation of this test.

Two independent fixes:
- need to prefix symbols referenced from asm with underscore;
- need to undo the C-function prelude.

Mostly intended to ease experimentation, no particular plans for APIs
so far (far less their stability), is_preempt_thread() provided is
mostly an example.