Improve characteristic selection and checking

[Jake]

• Allow also write property, for #27
• Check for correct props earlier, only chose it if this matches

Idea is to filter by included list or user supplied uuid AND filter by required permission flags, instead of asserting this later. Result should be exactly one, raise otherwise.
If < 1: No characteristic with {req_prop} property found!
if > 1: Multiple matching {type} characteristics found, please specify one
Include options with details in log, especially on error.