Registration for features

[arturkamieniecki]

I've created a registration system for registering features.

The new registration context methods are:

• RegisterFeature (templated with feature class) - allows for named feature registration, the class needs to inherit from the FeatureBase
• CreateFeature - as arguments it gets the uuid of the feature, agent id, and conversation ID for communication
• GetFeatureNamesAndUuids - gets the full list of registered features and the UUIDs

I've also added a conversation bus with notifications for getting a new user message and returning the response.

I've moved some includes in the qt widgets to prevent errors during mock runs.