QFunctionTableView: Add header with context menu for column visibility #1483

Job	Run time
ci / Build	6m 22s
ci / Test (0)	1m 5s
ci / Test (1)	1m 12s
ci / Lint	1m 13s
ci / Test (2)	1m 16s
ci / Test (3)	1m 18s
ci / Test (4)	1m 20s
ci / Test (5)	1m 39s
ci / Test (6)	2m 2s
ci / Test (7)	1m 6s
ci / Test (8)	1m 22s
ci / Test (9)	1m 37s
ci / Publish Unit Tests Results	1s
	21m 33s

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