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Fixes #1619

Requiring the auto-discovery tool and serial monitor if they have not already been included by other boards (namely if AVR cores have been uninstalled in the IDE).

If another packet comes in between freeing `_rx_buf` and setting `_rx_buf` to 0, that new packet could get put into the same memory address and get concatenated to itself, which leads to an infinite loop.
New solution assigns a temp pointer, sets `rx_buf` to 0, then frees the memory, which guarantees `_rx_buf` always points to valid data.

Fixes #1620

Board documentation can be found here:
https://silicognition.com/Products/rp2040-shim/Signed-off-by: Patrick Van Oosterwijck <patrick@silicognition.com>

The `_idedata` has been changed to `__idedata` in newer PlatformIO core versions per https://github.com/platformio/platformio-core/commit/158aabbdf23ed1ff8f5e3f01fb4ef1723a78d3bb. This change has broken the logic to expand out the `-iprefix PATH @INCLUDEFILE` argument into its individual include paths, causing Intellisense breakages on some VSCode systems and other IDEs that didn't handle these arguments correctly or in which the path was corrupted.

When we swap the Wire objects, we need the i2c0 IRQ shim to call
Wire1.onIRQ, not the usual Wire.onIRQ.  Same for i2c1 IRQ shim.

Fixes #1607

Thanks to @pietglas for finding and fixing.  See #1590 for more info.

See #1590

Spelling mistakes and grammatical corrections

Fixes #1065

See #1161

The PicoProbe firmware has only supported  CMSIS-DAP for some time, make it the default debugging option to work around IDE 2.0 issues.

Fixes #1552

Ensure that 64 bit multiplication is done when calculating the total size
available and used for SDFS.

This should reduce the `git submodule update` space required as well as
avoid the max-path-len errors under Windows in most cases.

Serve next wificlient (http_request) if current client does not have data

* Enable proper reuse of PIO programs

Rewrite the PIOProgram helper class to properly re-use loaded programs
and to try to re-use loaded instructions before allocating a new PIO
program.

Supersedes #1524

* Less copy-pasta

Handle the case where the DMA manager is unable to completely allocate
needed resources (DMA channels or memory) and return `false` in ::begin()

Per https://github.com/earlephilhower/arduino-pico/pull/1524#issuecomment-1587885054

Per https://github.com/earlephilhower/arduino-pico/pull/1524#issuecomment-1587562257