ArViz/Plotting: Added ability to transmit typstring

Vlad Korsakovrequested to merge
ulqba_korosakov/RobotAPI:arv/plot into arv/plot

In addition to a GVariant now, a typestring is transmitted, so that the GVariant can be deserialized correctly.

Signed-off-by: Vlad Korsakov vlad.korsakov@student.kit.edu

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