[WIP] Try out scalar parameters

[simsurace]

This is just an experiment to see what would break if we replace some vector parameters by scalars.

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
src/transform/scaletransform.jl	42.85% <62.50%> (-43.81%)	:arrow_down:

... and 27 files with indirect coverage changes

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