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effect The way it is now, `ClothVertex->mass` is setup once for the clothObject and then reused if it already exists [so does not change across frames/ steps] which happens in`cloth_from_object` / `do_init_cloth`, where `SIM_cloth_solver_init` / `SIM_mass_spring_set_vertex_mass` are called and set up masses in `Implicit_Data`. Seems possible to update `ClothVertex->mass` every step in `do_step_cloth`, however it seems more involved to update the masses in `Implicit_Data` there as well. The masses from `Implicit_Data` are accessed in many places, so it would be mandatory to have these masses kept up-to-date (and even then it is unclear if the solver was designed to work with these animated or if there are assumptions about this being stable across the sim). So propose to remove the (broken/not implemented) animation capabilities on the property instead. Maniphest Tasks: T88188 Differential Revision: https://developer.blender.org/D11225
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