QFunctionTableView: Add header with context menu for column visibility #1484

Job	Run time
ci / Build	9m 5s
ci / Lint	1m 10s
ci / Test (0)	1m 5s
ci / Test (1)	1m 15s
ci / Test (2)	1m 10s
ci / Test (3)	1m 18s
ci / Test (4)	3m 7s
ci / Test (5)	1m 59s
ci / Test (6)	1m 32s
ci / Test (7)	1m 4s
ci / Test (8)	1m 7s
ci / Test (9)	1m 22s
ci / Publish Unit Tests Results	1s
	25m 15s

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