Native emitter can now compile try/except blocks using nlr_push/nlr_pop.
It probably only works for 1 level of exception handling.  It doesn't
work on Thumb (only x64).

Native emitter can also handle some additional op codes.

With this patch, 198 tests now pass using "-X emit=native" option to
micropython.

Based on forum post: http://forum.micropython.org/viewtopic.php?f=6&t=193

windows: Sync mpconfigport.h with the unix' version

I.e. don't assume that both are always present.

- rearrange/add definitions that were not there so it's easier to compare both
- use MICROPY_PY_SYS_PLATFORM in main.c since it's available anyway
- define EWOULDBLOCK, it is missing from ingw32

It defines types used by all other headers.

Fixes #691.

unix: Fix mpconfig.h not being included before misc.h

This fixes count_lead_ones in misc.h not compiling due to unknown types

Unicode is disabled by default for now, since FileIO.read(n) is
currently not implemented for text-mode files, and this is an
often function.

This enables testing unicode and non-unicode implementations.

Conflicts:
	py/mpconfig.h

With a test which cannot be automatically validated so far.

Commented out so far, as enabled leads to dozen more bytes used actually
(due to string pooling effects).

To squeeze few more hundreds of bytes.

array.array and bytearray share big deal of code, so to get real savings,
both need to be disabled.

This port supposed to be demo of uPy minimality, so let people behold it in
details.

As stack checking is enabled by default, ports which don't call
stack_ctrl_init() are broken now (report RuntimeError on startup). Save
them trouble and just init stack control framework in interpreter init.

Change MCU name config micro

unix: Remove unused CTRL-D definition

Add MICROPY_HW_MICRO_NAME to boards config

Based on config define.

Useful when we have pointer to char inside string, but need to return char
index. (E.g. str.find()).