Translated the German `source layout` table into English to conform with the rest of the file contents.

…ish-patch

Update Contributing.md

… as author/libname

…ion]]

  The LetsEncrypt DST Root CA X3 expired in 2021 and was replaced
  with the ISRG Root X1 CA. The DST Root CA X3 was still a working
  trust anchor but the ISRG Root X1 CA is the preferred one and
  should be good until 2035.

- run on all beta* branches
- update python and action versions
- make airrohr-update-loader build/store steps
  conditional (not for esp32 branches)

…talling OTA downloads

- Code specific for Core > 3.0 is commented out
- WiFi.persistent(false) is re-enabled (default is true on Arduino Core < 3.0)
  This reverts commit 76240f5.

- Disable default -Os optimization for size
- Set -O2 explictly in build_flags

This can be tweaked depending on the performance of the resulting builds.

Also show all connection failures

- This increases program size significantly but gives much better
  performance with WiFi signal strength below -80dB

Fix reference to SSD1306 library. Rewrite other external dependencies as author/libname

Fixed typo in string

Including translation to PT-BR

Create intl_br.h

Update intl_sk.h

  The LetsEncrypt DST Root CA X3 expired in 2021 and was replaced
  with the ISRG Root X1 CA. The DST Root CA X3 was still a working
  trust anchor but the ISRG Root X1 CA is the preferred one and
  should be good until 2035.

…definition]]

Fixed typo in string

…ment

- Disable default -Os optimization for size
- Set -O3 explictly in build_flags

This gives a well performing binary for this particular codebase.
Can be tweaked depending on the performance of the resulting builds.

Fixed Str2F conversion error in Offsetcalculation

Translated the `source layout` section from German.

patch to re-enable the ability to use WiFi with no password, like freifunk routers use to use.

…ta-sen5x

Add Sensirion SEN5x to Beta

…ot-x1

Replace DST Root CA X3 with ISRG Root X1

…inaries can be built

This reverts commit 4a93e78.

…ble anymore

beta updates with various bugfixes and stability improvements

…tgart/beta-sen5x"

This reverts commit 04186cf, reversing
changes made to 06d0e80.

This only reverts the SEN5X specific code. Other changes (mainly
language fixes) are kept. The [env:d1_mini] in platformio.ini is also
reverted to prevent overwriting the nodemcuv2_fr build in build runs.

…ert-beta-sen5x-part-of-pr1019

Revert "Merge pull request opendata-stuttgart#1019 from opendata-stuttgart/beta-sen5x", removing SEN5X code for now

…ntl-fixes

Add missing whitespace and PROGMEM declarations

Sensor.Community API, Madavi API and Auto Updates are enabled by default for first config.

This is a reapply of "Merge pull request opendata-stuttgart#1019 from opendata-stuttgart/beta-sen5x"
This reverts commit 5a67d5d.

This revert-of-the-previous-revert creates a single commit to add
all SEN5X code to the latest beta-branch. Changes in this branch after
this commit can again be merged into beta.

This reverts the downgrade to core 2.7.4 and related compiler options.

This will break OTA updates

This reverts commits 78c6c94,
                     d1b8aad,
                     b2e4d26.

Needed to get a decent performance