* add patternstart command for CTB, block end of execution udp packets if pattern was started by patternstart command
* update docs
* Dhanya's comments
* more Dhanya comments
* refactored
* fixed tests for startpatttern, also clkfrequency not properly used in server
* xilinx: fixed setfrequency, tick clock (with sync clock), clkfrequency set from getfrequency to get the exact value
* xilinx freq in kHz, updated default values and prints
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Co-authored-by: Martin Mueller <martin.mueller@psi.ch>
Co-authored-by: Dhanya Thattil <dhanya.thattil@psi.ch>
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