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Fixes #1356

Mac and Windows have case-insensitive filesystems, so the will find
the internal (all-lowercase) "btstack.h" and not the library's "BTstack.h",
causing compilation errors.

Rename the library and header to avoid the issue.

Fixes #1344

Fixes #1338

To be revisited when TinyUSB native support is added and picked up in the SDK

See #1311 for more info.  __isFreeRTOS is C++ linkage and only used
in the core proper (all C++).

Allow sending thigns like KEY_MUTE or KEY_SCAN_NEXT from the USB and
Bluetooth Classic keyboard libraries.

BLE requires some add'l magic, not yet discovered.

Pull in latest upstream Keyboard library changes

Allow users of boards like the Pico-Audiom where the LRCLK comes
before the BCLK pin, to swap the BCLK/LRCLK of the I2S interface.

Fixes #1287

The BTstack driver includes a basic Arduino library as part of the ports
directory.

Fixes #1285 (or at least works well enough for now)

* make the main SPI SPI (even tho its on SPI1)

* fix Wire to default pins

Thanks to @e-tinkers for the initial PR!

SDK 1.5 changed the behavior of the underlying CYW43 blob, and it seems
to block MDNS multicast by default.  Manually add back the Ethernet MACs
used for MDNS multicast in IPV4 and IPV6.

Fixes #1267

It seems possible now for TCP connection _pcbs to disappear while being
processed, due to the new async context configuration.  This would cause
LWIP to panic when a NULL pcb was passed in.

Check for and avoid passing in null PCBs in the ClientContext.

Undo special-casing of sys_check_timeouts wrapper

AdvancedWebServer with heavy F5-refresh and #1274 test both pass.

Fixes #1274

Co-authored-by: timboldt <tim.boldt@gmail.com>

BLE seems to require some kind of characteristic callback that is not yeet
implemented here.  USB and BT tested and examples updated.

Move the Joystick, Keyboard, and Mouse into a base class which handles
the operation/input, and a subclass which will implement the reporting
as a HID device via USB, Bluetooth Classic, or Bluetooth Low Energy (BLE).

Reduce copies of library code and makes maintainability much better.

Includes option for QSPI/4 flash access on specific Adafruit boards for use when overclocking.