Cleanup HydroDyn and SeaState code #2280

Job	Run time
build-drivers-release	6m 28s
build-postlib-release	12m 48s
build-all-debug-single	3m 25s
build-all-debug	6m 10s
build-test-uadriver-debug	2m 15s
rtest-modules-debug	4m 59s
rtest-module-drivers	2m 48s
build-openfast-release	3m 3s
build-fastfarm-release	12m 57s
build-interfaces-release	5m 49s
rtest-OF-5MW_Land_AeroMap	1m 19s
rtest-OF-5MW_Land_BD_DLL_WTurb	3m 2s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	2m 21s
rtest-OF	7m 20s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	7m 22s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	1m 12s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	2m 7s
rtest-OF-linearization	2m 22s
rtest-OF-simulink	18m 47s
rtest-interfaces	7m 26s
rtest-FF	2m 49s
	1h 56m 49s

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