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Avoid issues with interrupts and priority inversions and other deadlocks
and use a SW based random generator for LWIP when under FreeRTOS.

This means removing any overrides for sleep_until and the two
get_rand_xx calls from the SDK, making things much saner.

Related to #1883, #1872, and other random FreeRTOS lockups.

* Corrected minor typo.

* Removed superfluous newline.

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Co-authored-by: Dominic Pearman <dominic@phymorous.de>

Fixes #1879
Fixes #1874

See #1875

Change "RP20400" to "RP2040"

Remove the always pending worker whose job it was to fire another async
worker after a timeout.

to have standard version with two parameters

and dnsIP(n) getter in WiFiClass too

Fixes #1846

Fixes #1841

Fixes #1835

If the BLE connection is severed, don't wait for the needToSend
flag to clear in the HID::send routine since it may never actually
clear unless the BLE connection is restored.

Partial #1817

Fixes #1814

std::bind can cause a memory allocation to occur during the periodic
polling interrupt which is a very bad thing.  Use a lambda instead.

Fixes #1812

As discussed in #1765.

Fixes #1786

* Aggregated several earlier patches in one to add RP2040-Eins board into the project.
- Moved RP2040-ProMini in alphabetical order position.
- Added board description files for RP2040-Eins.
- Added board header file for RP2040-Eins.
- Adjusted unused pins order of RP2040-ProMini to be the same as in RP2040-Eins.
- Added RP2040-Eins to README.md.
- Renamed board files to use underscores to better fit the existing file naming style.

* Updated README.md

, instead of .

* add sea-picro board

* add configurable board URL to makeboards.py

* update board URL for sea picro

* update note about QT port

* update pin mappings

* fix board vendor/name

* add Serial.dtr() and Serial.rts() methods

* added documentation for Serial.dtr() and Serial.rts()

Use __attribute((weak)) for _write() and other stubs called by newlib, so that sketch and library code can provide non-stub implementations (#1777)

* Clear dirty flag after commiting EEPROM to flash

* Styling: remove whitespace

Fixes #1769

Add a weak variable that can be overridden by the user to speed up or
slow down the USB HID polling speed.