New version: ModelPredictiveControl v0.19.0

[JuliaRegistrator]

• Registering package: ModelPredictiveControl
• Repository: https://github.com/JuliaControl/ModelPredictiveControl.jl
• Created by: @franckgaga
• Version: v0.19.0
• Commit: 90369ca98a15ef8aeea90004b7f4fe28840e21ca
• Reviewed by: @franckgaga
• Reference: JuliaControl/ModelPredictiveControl.jl@90369ca#commitcomment-139807546
• Description: An open source model predictive control package for Julia.
• Release notes:

**BREAKING CHANGE**
 `NonLinModel` constructor now supposes continuous dynamics by default. Use `solver=nothing` for discrete-time models.
 
changelog:
- added: support for `NonLinModel` with continuous dynamics
- added: 4th order Runge-Kutta solver with 0 allocation
- doc: the pendulum example now use the built-in Runge-Kutta solve
- added some tests with continuous `NonLinModel`

[github-actions]

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