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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.

No need to use my own fork, we're using the default upstream code.

BLE tested working with BTStack BLE hog-keyboard-demo.

* Update to Pico-SDK v1.5
* Hook in pico_rand, use ioctl to set ipv6 allmulti
* Move into PicoSDK LWIP mutex, hack timer sizes
* Utilize much of the PicoSDK infrastructure for WiFi
* Add WiFi::begin(ssid, pass, bssid)
* WiFiMulti to use BSSID, make more robust

WiFiMulti will now be more aggressive and try all matching SSIDs, in order
of RSSI, using the BSSID to identify individual APs in a mesh.

Before, if the highest RSSI AP didn't connect, it would fail immediately.
Now, it will go down the list, ordered by RSSI, to attempt to get a link.

* Add Bluetooth support from Pico-SDK
Able to build and run the HID Keyboard Demo from the Arduino IDE, almost
as-is.

Will probably need to make BT configurable.  Enabling BT on a plain WiFi
sketch uses 50KB of flash and 16KB of RAM even if no BT is used.

* Separate picow libs, BT through menus, example

Build normal Pico.a and 4 different options for PicoW IP/BT configuration.
Use IP=>IP/Bluetooth menu to select between options.

* CMakefile rationalization

* Move BT TLV(pairing) out of last 2 flash sectors

The pairing keys for BT are stored at the end of flash by default, but
we use the last sector of flash for EPROM and the penultimate one for
the filesystem.  Overwriting those in BT could cause some real exciting
crashes down the line.

Move the store to an app-build specific address using a dummy const
array to allocate space in the application image itself.

* PicoBluetoothHID with BT Mouse, Joystick, Keyboard

Add simple Bluetooth Classic HID helper function and port the existing
USB HID devices to it.  Port their examples.

* Protect BT key storage from multicore

* Add short-n-sweet Bluetooth documents

* Add Bluetooth Serial port library

* Turn off BT when the BT libraries exit

Return the pre-existing USB_PRODUCT/MANUFACTURER to the USB host in
the ID stage, allowing for reports like:

[1412958.589070] usb 1-6.3.4.1: New USB device found, idVendor=2e8a, idProduct=f00a, bcdDevice= 1.00
[1412958.589076] usb 1-6.3.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1412958.589079] usb 1-6.3.4.1: Product: Pico W
[1412958.589080] usb 1-6.3.4.1: Manufacturer: Raspberry Pi
[1412958.589081] usb 1-6.3.4.1: SerialNumber: E6614C775B6C7F31

or

[1413190.272233] usb 1-6.3.4.1: New USB device found, idVendor=2e8a, idProduct=1037, bcdDevice= 1.00
[1413190.272239] usb 1-6.3.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1413190.272242] usb 1-6.3.4.1: Product: HunterCat NFC RP2040
[1413190.272243] usb 1-6.3.4.1: Manufacturer: ElectronicCats
[1413190.272244] usb 1-6.3.4.1: SerialNumber: E6614C775B6C7F31

Many examples require that LED_BUILTIN be defined as a constant, so we
can't use a ternary operator to swap between Pico and PicoW LED pins.

Instead, do the check in the digitalWrite/digitalRead/pinMode calls
to cover most of the uses.

Still need it on the command line in platform.txt for upload/etc., but make the
debug script in lib/picoprobe_cmsis_dap.tcl include the adapter speed setting.

Co-authored-by: Earle F. Philhower, III <earlephilhower@yahoo.com>

The PWMAudio lib is expecting an int16_t value but the example passes a sample cast to uint16_t 
So any values from the lookup table that are negative are recast to 0 i think.
So half the sine wave in the case of the example is lost.

Use the RPi code to get a best-guess as to whether the board is a Pico or
PicoW.

Fixes #849

Fixes #1201