AD15: move wind velocity storage to miscvar in type RotInflow #735

Job	Run time
build-drivers-release	4m 41s
build-all-debug	5m 55s
build-postlib-release	9m 48s
build-all-debug-single	3m 15s
build-test-uadriver-debug	2m 19s
rtest-module-drivers	2m 41s
rtest-modules-debug	5m 1s
build-interfaces-release	3m 16s
build-openfast-release	3m 40s
build-fastfarm-release	10m 2s
rtest-interfaces	6m 30s
rtest-OF-simulink	10m 1s
rtest-OF	7m 24s
rtest-OF-5MW_Land_AeroMap	1m 27s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 48s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	1m 43s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	4m 57s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	53s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 25s
rtest-OF-linearization	2m 38s
rtest-FF	2m 9s
	1h 32m 33s

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