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Should speed up SD transfers significantly (2.5x+).

See #801

Decreases WebServer sketch sizes.

Fixes #816

If a byte is available, return it even if the USB stack reports
disconnected.

Fixes #811 

Don't try and heap allocate temporaty <16b chunks.

Fixes #795 

Replace all CoreMutex and Newlib mutex accesses with FreeRTOS calls
when in FreeRTOS mode.  Avoid issues with hange/etc. due to priority
inversion.

No changes to normal operating mode.

Add a FreeRTOS stress test that caught the issue fixed here.

Allows the IDE to detect boards when using the Keyboard, Joystick,
or Mouse libraries.

Thanks @DaleMitchell for the idea!

Fixes #797

* Add HTTP-parser lib to support ESP32 WebServer
* Add WebServer from ESP32.  Only supports HTTP
* Separate HTTP server from the network server
Instead of managing the WiFiServer/WiFiServerSecure in the same object
as the HTTP handling, split them into separate objects.  This lets
HTTP and HTTPS servers work without templates or duplicating code.
The HTTP block just gets a `WiFiClient*` and works with that to only
do HTTP processing, while the upper object handles the appropriate
server and client types.
* Add HTTPS server
* Clean up some THandlerFunction refs
* Refactor into a template-ized WebServer/WebServerSecure
* Add DNSServer examples which need WebServer
* Fix CoreMutex infinite recursion crash
Core could crash while Serial debugging was going on and prints were
happening from LWIP/IRQ land and the main app.
* Add HTTPUpdateServer(Secure)
* Add MIME include, optimize WebServer::send(size,len)
When send()ing a large buffer, the WebServer::send() call would
actually convert that buffer into a String (i.e. duplicate it, and
potential issues with embedded \0s in binary data).
Make a simple override to send(size, len) to allow writing from the
source buffer instead.
* Fix WiFiClient::send(Stream), add FSBrowser example

* Add HTTPUpdate class to pull updates from HTTP(S)
* Increase GH runners for pulls
WiFi builds and examples are taking some serious time now
* HTTPUpdate tests build on Pico W

OTA text error messages were getting lost because they were sent in
multiple UDP packets, one per print(). Now collect the full error and
report in a single print, allowing text messages to appear in ESPOTA.

Force the builder to include the path where we build the signing header.

Undo a breaking bug in the Updater class (TBD fix in ESP8266)

Fixes #783

Give a meaningful error when OTA is attempted against a chip which does
not have a filesystem configured.

Remove the need to have a separate WiFiClient that's destroyed after
the HTTPClient.  Let the object handle its own client, and pass through
any SSL requests.

Also supports the original ::begin methods which need a
WiFiClient(Secure) to be passed in and managed by the app.

If the WiFi network is already up, don't run the scan and connection
algorithm in WiFiMulti.

Add a simple DNS server for AP mode
Point DHCP server DNS entry to GW for DNSServer

According to the Arduino docs, update works just like put, but it first checks if the value is different from the current one.
This is how our put already works, so we just alias update to put and we're done.
Function added to be more compatible with the Arduino API.
Also see #778

Fixes #767

There may be an issue in the CYW43 driver that causes a link to never be
reported as going down once it has connected, when it was disassociated or
when the wlan shuts off unexpectedly.

Work around it by clearing the internal link active in a TCP callback for
the CYW43 driver.

Reports disconnection properly now, as well as reconnection.

Fixes #762

Takes a list of APs, finds the one with highest RSSI, and tries to connect.

rp2040.reboot() would set a reboot timer for 100ms in the future, but then
return to user code and ran it until the timer expired.  Now infinite loop
until the WDT fires.

Fixes #768

Fixes #758

Partial #754

Adds a 12K OTA stub 3rd stage bootloader, which reads new firmware
from the LittleFS filesystem and flashes on reboot.

By storing the OTA commands in a file in flash, it is possible to
recover from a power failure during OTA programming.  On power
resume, the OTA block will simply re-program from the beginning.

Support cryptographic signed OTA updates, if desired.  Includes
host-side signing logic via openssl.

Add PicoOTA library which encapsulates the file format for
the updater, including CRC32 checking.

Add LEAmDNS support to allow Arduino IDE discovery

Add ArduinoOTA class for IDE uploads

Add MD5Builder class

Add Updater class which supports writing and validating
cryptographically signed binaries from any source (http,
Ethernet, WiFi, Serial, etc.)

Add documentation and readmes.