Convert INVTYPE boolean fields to flagmask #471

Job	Run time
workflow_setup	4s
build (English) / compile (ja2)	5m 17s
build (German) / compile (ja2)	5m 21s
build (English) / compile (ja2mapeditor)	5m 46s
build (German) / compile (ja2mapeditor)	5m 25s
build (English) / compile (ja2ub)	5m 37s
build (German) / compile (ja2ub)	6m 8s
build (English) / compile (ja2ubmapeditor)	5m 58s
build (German) / compile (ja2ubmapeditor)	5m 43s
build (English) / assemble	0s
build (German) / assemble	0s
release	0s
	45m 19s

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