One can instead lookup __name__ in the modules dict to get the value.

According to the Arduino ESP8266 implementation the first argument to the
wifi scan callback is actually a bss_info pointer.  This patch fixes the
iteration over this data so the first 2 entries are no longer skipped.

Fixes issue #2372.

Instead of calling strlen(), which won't work if there're 32 chars in
returned ESSID. struct bss_info::ssid_len is not documented in SDK API
Guide, but is present in SDK headers since 1.4.0. Just in case, previous
code is left commented.

Ctrl-C will raise a KeyboardInterrupt and stop the scan (although it will
continue to run in the background, it won't report anything).  If
interrupted, and another scan() is started before the old one completes
in the background, then the second scan will fail with an OSError.

scan() allocates memory so may cause an exception to be raised.

These symbols are still defined in terms of the system Exxx symbols, and
can be switched to internal numeric definitions at a later stage.

Note that extmod/modlwip still uses many system Exxx symbols.

Querying/setting MAC address is pretty adhoc operation to belong to
.config() instead of taking a whole method on its own.

Network interfaces are now controlled individually using .active() method.

Allow setting ip, netmask, gw and dns server (also, allows getting dns).
For docs see: https://github.com/micropython/micropython/commit/06deec9

That is: aps = if0.scan()

TODO: make sure that returned list has tuple with values in "standard"
order (whatever that standard is).

These are expected to be passed to network.WLAN() to instantiate network
interface objects.

Allows to set (in case keyword args are given) or query (in case a single
"symbolic keyword" (a string, value is the same as keyword)) arbitrary
interface paramters (i.e. extensible and adaptable to various hardware).

Example usage:

ap_if = network.WLAN(1)
ap_if.config(essid="MicroPython on Air")
print(ap_if.config("essid"))

Allows to up/down interface when called with a boolean, or query current
state if called without args. This per-interface method is intended to
supersede adhoc network.wifi_mode() function.

On ESP8266, there're 2 different interfaces. Pretending it's not the case
desn't make sense. So, network.WLAN() now takes interface id, and returns
interface object. Individual operations are then methods of interface
object. Some operations require i/f of specific type (e.g. .connect()
makes sense only for STA), other are defined for any (e.g. .ifconfig(),
.mac()).

MicroPython "network" module interface requires it to contains classes
to instantiate. But as we have a static network interace, make WLAN()
"constructor" just return module itself, and just make all methods
module-global functions.

Addresses issue #1022.

This is just a clean-up of the code.  Generated code is exactly the
same.

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

It defines types used by all other headers.

Fixes #691.

Blanket wide to all .c and .h files.  Some files originating from ST are
difficult to deal with (license wise) so it was left out of those.

Also merged modpyb.h, modos.h, modstm.h and modtime.h in stmhal/.

Towards addressing issue #424.

Had a small increase to ROM usage (order 60 bytes).