WIP: read from serial on arduino and make a network call, save to SD card on arduino, task queue on esp32 espnow receiver

WIP: parsing of json response body

Deep Sleep Namespace

See merge request !9

refactor f_deep_sleep.cpp into its own namespace, add boot counter, move to ESPLOG for wakeup reason

add small project for receiving espnow material from a host, transferring it via serial to another esp and finally storing it on a SD card

# Conflicts:
#	client/client/lib/espnow/src/ESPNow.cpp
#	client/client/lib/espnow/src/Message.cpp
#	client/client/lib/espnow/src/Message.hpp
#	client/client/src/main.cpp
#	host/fipy/main.py

move to c++17, change message building, refactored SensorInformation and MeasurementData

See merge request !7

- messages are now built using the constructor
- messages now only contain a single measurement value, even if a sensor might include more than one measurement
- buildMessage has been changed to buildMessages and now returns a list of messages depending on how many measurements a sensor contains
- ClientDataPackage now builds from SensorInformation and MeasurementData
- minor naming refactors

-sensor readout finished
TODO
-implement esp_now protocoll to transfer the Data

# Conflicts:
#	client/client/src/main.cpp

fipy host broadcasts its mac + timestamp on start, main function of client updated according to last commit

Closes #4

Merge Branch `develop` into `sensor_readout`

See merge request !3

add message tests

See merge request !4

# Conflicts:
#   .clang-format
#   .gitignore
#   .vscode/extensions.json
#   .vscode/tasks.json
#   client/client/lib/README
#   client/client/platformio.ini
#   client/client/src/main.cpp