Add calendars to schedule EVU, hot water block and reduced temperature

[hashtagKnorke]

the additions provide APIs to set a certain schedule

tested on an

"profile": {
        "icon": 2,
        "id": 1005,
        "name": "IQ",
        "thermiaName": "iTec"
    }

[klejejs]

Thank you for attempting to add the calendar feature to the API. Overall, it looks good, however, I added some comments for improvements.
Also, please run the linter black ThermiaOnlineAPI/ to lint the changes and it would be nice to look into adding some tests for this as well.

[hashtagKnorke]

all comments should now be resolved or justified in conversation