Major tmtccmd overhaul

[robamu]

• Improve core API: Changes core functions to setup and run. Requirement to user to create backend. Makes it easier to directectly configure the backend and move to a generally more pythonic API
• Simplified hook object, removed multiple obsolete functions
• Exposed API to create two new file loggers: A raw PUS logger using rotating files and a generic TMTC logger which uses a new file for each TMTC session
• Updated CCSDS Handler to make it more easily extensible by creating a new ApidHandler class
• New Pre-Send Callback which is called by backend before sending each telecommand