refactor f_deep_sleep.cpp into its own namespace, add boot counter, move to...

See merge request !11

merge serial comm and sd write into  espnow

See merge request !10

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