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Fixes #1402

The global USB mutex is auto-shadowed with a FreeRTOS semaphore while in
FreeRTOS mode.  Unfortunately, while the core was using the proper
FreeRTOS semaphore to lock access to the USB port, the actual FreeRTOS
USB task was using the naked Pico SDK mutex, leading to cases where it
could acquire the mutex even though some other FreeRTOS task actually
owned the shadowed mutex.

Properly lock the shadowed Semaphore, not mutex_t, in the FreeRTOS
USB periodic task.

Matches the flash size defined in the menus.

Fixes #1399

Fixes #1412

See https://github.com/esp8266/Arduino/pull/8907

Fixes #1382

Fixes #1370

Adds a simple helper assertion to tell the user how to enable BT if it's
not enabled, instead of some odd compilation warnings about undefined
functions.

Change “N” to “M” and add “HOST” in the USB pins. Only two pins are actually affected; diff appears large to maintain the pleasant aligned-columns format.

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>