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Allows printing "."s or flashing an LED while NTP is waiting for sync.

Simple sketches should work without modification, but some modes (listed
in the docs) are not possible to support on the Pico W with BearSSL.

Fixes #691

Fixes #688

IPv4-only mode saves 20KB+ of flash memory.

Add some backwards compatibility with the global Arduino Ethernet
class when running in IPv4 only mode.

Fixes #687

* Speed P.IO build by not cloning 2GB of sources
* Document P.IO new option

Co-authored-by: Benjamin Aigner <beni@asterics-foundation.org>

The SDK disabled float/double support for some functions by default on the
original B0 ROMs.  Manually re-enable it.

Fixes #689

* Add LWIP defines from platform.txt

* Add WiFi example to PIO CI

* Add TLS (https) support
* Add NTP server
* Clean up include path, add BearSSL headers
* Allow 2 NTP servers, add ESP8266 compat define
* Add MFLN SSL example, free/used/total heap getters
* Enable stack thunking
* Add tested SSL examples
* Add BSSL_validation demo
* Add Client Certificate example
* Add RP2040 helper docs
* Clean up doc errors, missing doc version info
* Add WiFiClientSecure documentation
* Add NTP docs

Fixes #679

Fixes #680

* Add support for the WiFi chip on the Pico W board.
* USB interrupt now no longer hard coded (conflicted with the WiFi IRQ).
* Add in Pico W board to makeboards.py
* Add in GPIO and variant support
* Initialize WiFi in the Variant
* Use manual LWIP, fix size accounting
* Remove the SDK WiFi overrides
* Pulling in work done in the ESP8266 core.
* Make IPAddress support IPv6
* Build LWIP with IPv4 and IPv6 support
* Use proper MAC
* Avoid cyw_warn crash.  Make macro to a comment while building
* Add WiFiServer
* Add WiFiUdp
* Move LWIP-specific support files to LWIP_Ethernet
* Add WiFi::ping (ICMP ping)
* Move ICMP echo (ping) to LWIPIntfDev
* Move hostByName to LwipIntfDev
* Add AP mode with simple DHCP server
* Add some examples and basic ESP8266 compat hacks
* Update Adafruit TinyUSB to fix crash
* Set DHCP hostname
* Make Wifi.begin() return CONNECTED with link + IP
* Return connected() on WiFi::begin
* Fix spurious TCP retransmission
* Protect LWIP from reentrancy

The Pico SDK calls "sys_check_timeouts() from inside a periodic interrupt.
This appears unsafe, as the interrupt could happen while already in the
(non-reentrant) LWIP code.

Block the interrupt from calling sys_check_timeouts by using a global flag
manually set via an RAII recursive lock.

Add interrupt protection macros around critical sections inside LWIP via
the standard defines.

These two changes should make LWIP significantly more stable and long
running.

* Support disconnecting and reconnecting WiFi
* Add WiFiServer simple example
* Update documentation

Fixes #666
Fixed #665

When real multicore/lockign support was added to newlib, there was an opaque
field in FILE that was used as a mutex, but was only 4 bytes in size.  The
recursive mutexes on the RP2040 are 8 bytes.  This mismatch caused corruption
of the FILE structure and crashes of the system when ::printf/::puts/etc. were
run.

Adjust the lock field size in FILE to 8 bytes and rebuild the toolchain to
fix.

No idea why, but when a Picoprobe upload and reset is used, the 2nd core
does not start w/o a __wfe() call on the first one before launch.

Fixes #674
Fixes #402

Fix errors in WebUSB buffering
Fixes #642

Keep the Arduino Board Manager list up-to-date from makeboards.py

Before always returned 0 on a ::write.  Now properly return the count
of bytes that were sent to the USB port.

Thanks to Terry Haas for the report.

Fixes #648 

* Update to Adafruit_TinyUSB_Arduino 1.12.0

* DualRole requires add'l libraries, skip in CI

Fixes #651

Need to manually list the secrets to export to the environment.

Minor change to keep the core all CPP.  Patch just made it into pico-sdk
develop branch allowing recursive mutexes to be auto_init in C++.
Update and rebuild libpico.a.

There was a race condition in making mutexes that were only init in
an __attribute((constructor)) code block.  For example, a global
object might do a `malloc` in its constructor which would depend on
the malloc mutex...which may not yet have been initted.

Make them initted in the .data section, instead, which is guaranteed
good before any global constructors are called.

Fixes #643