New version: KiteModels v0.6.8

[JuliaRegistrator]

• Registering package: KiteModels
• Repository: https://github.com/ufechner7/KiteModels.jl
• Created by: @ufechner7
• Version: v0.6.8
• Commit: 698c9336b05bd73967c99d6175c56c4b3740eb4a
• Reviewed by: @ufechner7
• Reference: Register package ufechner7/KiteModels.jl#9 (comment)
• Description: Kite and tether models for the simulation of kite power systems
• Release notes:

#### Changed
- the sign of the steering signal was changed. Now, a positive steering signal causes a positive turn rate.
  The turn rate is the derivative of the heading angle.
- all orientation tests pass now (calculation of roll, pitch, yaw, azimuth_north, elevation, heading)
- add example `steering_test_1p.jl`
- improve `steering_test_4p.jl`, use fully powered kite now
- the logged steering signal is now divided by `set.cs_4p`, because the new version of KitePodModels.jl multiplies the steering value with this constant
- update documentation regarding `steering` and `heading`

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