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

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

Espnow

See merge request !1

- added test token that allows read/write to
  test bucket

- move data_struct to ClientDataPackage.hpp
- move Message definition to Message.hpp
- move Message code to Message.cpp
- move global time variable to its own namespace called esptime
  - time accessible via esptime::rtc
- Message now uses ClientDataPackage instead of data_struct
- ram_caching now uses ClientDataPackage instead of data_struct
- switched from pointer definition of Message to default constructor
- move headers to hpp files where applicable
- added ArduinoJson library (does not increase space by a lot)

-added an example "sensor_statin" which read out all sensor values(has been used in the meeting of 11 Aug)
-added an code snipped "INA219_POWER_MESURMENT_STATION" to measure the power consuption of the esp mit betka