WIP: Ratcliff Diffusion Model pdf and simulators#90

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kiante-fernandez wants to merge 3 commits intoitsdfish:masterfrom

kiante-fernandez:full_DDM

Commits on Jul 12, 2024

new interface ratcliff DDM
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Commits on Jul 13, 2024

tracking the use normalized time for debugging _pdf.
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Commits on Jul 14, 2024

validated REwritten wfpt
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