[mc_rtc/gui/plot] Allow to provide XY data as chunks #1214

Job	Run time
build (ubuntu-20.04, Debug, gcc)	48m 23s
build (ubuntu-20.04, Debug, clang)	33m 9s
build (ubuntu-20.04, RelWithDebInfo, gcc)	1h 1m 57s
build (ubuntu-20.04, RelWithDebInfo, clang)	44m 10s
build (ubuntu-20.04, script, gcc)	1h 29m 34s
build (macos-latest, Debug, gcc)	1h 29m 51s
build (macos-latest, RelWithDebInfo, gcc)	49m 34s
build (macos-latest, script, gcc)	1h 3m 23s
build (windows-latest, RelWithDebInfo, gcc)	1h 36m 37s
build (windows-latest, script, gcc)	1h 15m 19s
	10h 51m 57s

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