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The outputexpors target, which exports Zephyr environment variables, was
recently added to Zephyr. By exploiting this feature we can hugely simplify
the build system, improving robustness at the same time.
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

By tricking Zephyt arch Makefiles compute them for us (not just for
Zephyr). This make potentially break as Zephyr evolves.

The two variables, GENERIC_TARGETS and CONFIG_TARGETS come, respectively,
from the the lists shown during "make help" and "make kconfig-help".
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

Currently to compile for anything that except ARCH=x86 we have to
provide ARCH via the environment or make arguments. We can do better
than that!
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

From https://github.com/pfalcon/zephyr_getchar .

Also, drop deprecated (as for MicroPython) readall() method.

To save iRAM.

Reduces esp8266 code size by about 230 bytes.

This is an often used code pattern, and its use reduces code size of the
core by about 100 bytes.

Added options to make deploy so it can be used for ESP8266 boards with
other flash configurations.  For example NodeMCU DEVKIT V1.0 can now use:

    $ make FLASH_MODE=dio FLASH_SIZE=32m deploy

The deleted code is unreachable because calcsize_items guarantees that
num_items corresponds to how many items there are in fmt to unpack.

SHA1 can only be supported if ussl module is compiled in, and it uses
axtls.

The output might contain more than one line ending in 5b so properly skip
everything until the next known point.
This fixes test failures in appveyor debug builds.

Implementation of machine.RTC.alarm_left(), like described in the
documentation.