New version: KiteViewers v0.4.21

[JuliaRegistrator]

• Registering package: KiteViewers
• Repository: https://github.com/aenarete/KiteViewers.jl
• Created by: @ufechner7
• Version: v0.4.21
• Commit: b8d368dd29ac4c61adf1b886242e82ef71807f08
• Reviewed by: @ufechner7
• Reference: Register package aenarete/KiteViewers.jl#13 (comment)
• Description: 3D viewer for airborne wind energy systems
• Release notes:

#### Fixed
- fix display of kite in `KPS_3L` model
- make `menu()` work
#### Changed
- reexport `KiteUtils`
- automatically execute `using KiteViewers` when starting Julia with `./bin/run_julia`
- improved the script `bin/install`

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