Need to refactor connectors and related code

Some derivative classes from editor_Services_Connector_Abstract at least editor_Services_OpenTM2_Connector and its related classes like editor_Services_OpenTM2_HttpApi need to be refactored because of grown complexity. Classes have grown significantly and it becomes more and more challenging to maintain them.
What should be done:

• Split code to smaller classes
• Complete all TODOs and FIXMEs
• Change processResponse to return typed DTO instead of stdClass
• Remove public setters such as setResource and setLanguageResource etc. since they are breaking encapsulation and making it possible to have the model in an invalid state
• Change resultList to be initialized on every request instead of constructor
• Make services to be retrieved from registry and make them to be guessed by name and not by class (Original discussion here https://bitbucket.org/mittagqi/translate5/pull-requests/804)
• Clean Up Fuzzy TM stuff, currently is cluttered over multiple levels of code and is to error prone (by saving fuzzy TM name to DB in case of errors etc)