Update processing

[StefanoSperetta]

Update the processing and displaying of the data:

• reduce the number of allocation for XTCEParsers: now it happens only once per thread
• only call the processing thread of satellites that actually have a processor
• avoid calling processing threads for satellites that have no frame to process
• reduce the number of connections to influxDB: now it happens twice per raw frame to be processed, maxing ~10 connections per second
• start the scheduler once when the server starts to limit the risk of double initialization
• remove XTCEParsers creation in scheduler
• fix unit tests related to processing
• create dummy influxDB server for testing
• create dummy satellite processor for unit tests
• check if frame belongs to stream in raw frmes processor, rather than checking if frames is correct. This should make sure all frames from a satellite (even if no specific frame is described in telemetry) are moved to the raw bucket
• delete processed frames
• figure out if all frames in buffer make it to the raw bucket