Decouples Signal sources from their smooth wave shapes

[ven-k]

• Adds wave_functions to Blocks. The *Function components give out y output of * shape
• Tests the wave-functions
• Removes all shaped voltage sources in favour of VoltageSource

TODO:

• Add tests for CurrentSource + Functions

[ChrisRackauckas]

I'm not sure this applies after #7.

[ven-k]

#7 added docstrings and updated connector.

This PR serves a different purpose.
This PR moves smooth functions to Blocks and then exports only one VoltageSource and a CurrentSource. Mix and match of smooth wave generators in Blocks and these sources will give out the signals of required shapes.
This reduces n_shapes*n_dimensions to n_shapes+ n_dimensions.

For example
(provided by @baggepinnen)

where a sin source is connected to a torque converter. The torque converter could easily be replaced for a voltage/flow/current converter for a different application

Current status:

• Signals and Shapes are already decoupled
• Doesn't work for non zero starttime Using continuous_events on connected circuits/systems ModelingToolkit.jl#1409

If necessary I can set all starttime to 0; and rebase to main . The unit tests will pass. And whenever the issue is fixed upstream, I'll fix this.

[ValentinKaisermayer]

I'm not sure this applies after #7.

I guess you meant #26

[ValentinKaisermayer]

A similar example to the one above is already present in main.

ModelingToolkitStandardLibrary.jl/test/Mechanical/rotational.jl

Line 31 in 99b273d

@testset "two inertias with driving torque" begin

What would be needed are corresponding smooth source functions in Blocks, see #30.

[ven-k]

What would be needed are corresponding smooth source

Perfect. This adds smooth functions.