Cleanup HydroDyn and SeaState code #2294

Job	Run time
build-all-debug-single	2m 58s
build-drivers-release	4m 41s
build-postlib-release	9m 23s
build-all-debug	5m 42s
build-test-uadriver-debug	2m 6s
rtest-module-drivers	2m 49s
rtest-modules-debug	5m 7s
build-interfaces-release	3m 25s
build-openfast-release	3m 11s
build-fastfarm-release	13m 27s
rtest-OF-simulink	9m 58s
rtest-OF-5MW_Land_AeroMap	1m 29s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 2s
rtest-OF	7m 17s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	2m 17s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	4m 53s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	51s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 23s
rtest-OF-linearization	2m 35s
rtest-interfaces	5m 3s
rtest-FF	1m 51s
	1h 32m 28s

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