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See #851.  Add SPI1.

Co-authored-by: Dario Gogliandolo <dario.gogliandolo@smartme.io>

Use #include .... to reference them from the cores directory to ensure
they keep up to date.

Add calls to `tud_task` to pump the USB interface in the SerialUSB methods.

See #832 for more info.

Fix #834

Because OTA has changed the flash map from standard, picotool ends up
crashing or hanging while trying to operate on the current built files.

Remove the binary_info calls and structures completely to avoid any
issue.

Fixes #803

Should speed builds up slightly, depending on the OS and virus scanning.

Fixes #747 while remaining ESP8266 compatible

Avoid creating Strings when sending out results.

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