rt_tests_support: Add PlotDataFileCreator class; Adjust sources
communication_tests: initial commit
communication_tests: Include gnuplot instructions in plot data file

Log files can directly be plotted by executing <gnuplot "logfile">
timer_tests/main.cpp: Minor refactoring
Lower internal measurement precision to microseconds
Move measurement data to MeasurementDataEvaluator class
timer_tests: Add Config class for process parameters
communication_tests: Add Config class for process parameters
timer_tests: Include gnuplot instructions in plot data file
Remove external gnuplot instruction sample
timer_tests/OneShotLatencyMeasurer: Minor refactoring changes
timer_tests: Remove GoogleTest
communication_tests: Remove GoogleTest
Remove GoogleTest sources
communication_tests: Allow running with real-time priority
timer_tests: Minor refactoring
communication_tests: Minor refactoring