Object analytics, PTZ and View Area support

Added Object analytics API
Added PTZ support and parameters
Added View Area support and parameters
Add support for user groups as well as to convert a pwdgrpcgi user to a user group if existing. This will later on be used to pin point what API calls can be done if the current users privileges are known.

Improve RTSP implementation by doing less in class init methods.
Stream lined pre processing of API responses. In some places pre processing was done in update method and in others in process_raw, in some places both where used.
Rewrote bits of event management to replace use of regex with xmltodict
Improved typing.
A lot of test improvements as well as an increase in test coverage.