Improve deform: linear interpolation for twist and average local airfoil normal #1221

Job	Run time
Documentation	2m 33s
Julia 1.12 - ubuntu-latest - x64 - with code coverage	13m 24s
Julia 1.12 - macOS-latest - aarch64 - pull_request	19m 38s
Julia 1.12 - ubuntu-latest - x64 - pull_request	21m 25s
Julia 1.11 - ubuntu-latest - x64 - pull_request	19m 2s
Julia 1.11 - ubuntu-latest - x64 - with code coverage	16m 4s
Julia 1.12 - windows-latest - x64 - pull_request	26m 12s
	1h 58m 18s

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