First brick request implementation

- netds: some changes, so that a brick of type uint8_t can be requested

- parameterwrapper: Params for brickrequests and filelist adapted.

- NEW CallPerformer: actually implements functionality of the calls,
parameterwrapper then takes the results and returns them to the client.
Added functionality to get a list of all uvf files, as well as
opening/closing and getting one brick
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