PoC: Generic Sensor Handling

[JoaDick]

@willmmiles Good news: The PoC for a generic handling of sensor readings that we discussed in #5319 turned out to be less complicated than initially expected!
Please try out the examples in UM_SensorInfo and UM_SensorDummy to see if this is going in the right direction.
I've also adjusted DHT, Temperature and Internal_Temperature_v2, but haven't been able to test it in-depth (my boards seem to be a bit shaky).

Concept & Features

• A usermod can provide one or multiple sensors.
• A sensor can measure physical (or theoretical/virtual) quantities (e.g. "Temperature", "Voltage", ... = measurand).
• Every Sensor...
  • Has a specific (unique) name.
  • Provides its data through one or multiple channels; one for each quantity.
• Every SensorChannel...
  • Has a specific name (unique per sensor).
  • Delivers its measured quantity as a SensorValue, which can represent one specific datatype (float, int, bool, ...).
  • Provides information about its measured quantity and datatype through properties.
• These SensorChannelPropertiesconsist of:
  • Datatype of the provided readings readings.
  • SensorValue's (typical) minimum range of operation.
  • SensorValue's (typical) maximum range of operation.
  • Name of the measured quantity, e.g. Temperature, Voltage, "NotKnownYet", ...
  • Unit of the measured quantity, e.g. °C, V, "WTF", ...
• Supported data types of SensorValue for sensor readings:
  • bool
  • float
  • int32_t
  • uint32_t
  • Array of values (prepared; not yet fully implemented - really needed?)
  • Struct of values (prepared; not yet fully implemented - really needed?)
  • Anything very specialized (through void* - although not recommended)
• Specific sensor channels that another usermod / effect is interested in can be filtered and accessed through cursors.
  • E.g. all channels with ValueType == float, or quantity = "Temperature".
  • Very easy customizable through own cursor implementations.
• Some helper classes and functions for usermods to provide sensor data with minimal effort.
• All in plain and type-safe C++ without any dirty hacks.

And don't forget to look at the Info-Page!

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