Simplify the system that reactively triggers realizations, at the cost
of removing the preconditioning step described in issue #101 and doing
unnecessary realizations after certain kinds of updates.
The new system should trigger a realization after any update that could
affect the assembly's deformation space. For simplicity, any update to
the regulator list triggers an update, even if it doesn't affect the set
of constraints. In particular, adding a regulator triggers an
unnecessary realization.
This PR helps probe the capabilities of the engine.
Also adjusts the realization triggering system to reduce redundant realizations as we set an assembly's regulators during loading. Specificially, consolidates all calls to `realize()` into a single effect, which is triggered by the `needs_realization` signal.
Also introduces a `keep_realized` signal and use it to pause realization while loading assemblies, but this signal is planned for removal as ultimately we do not want a separate "mode" of interpreting commands during loading, for maximal reproducibility of results (and simplicity of system).
Co-authored-by: Aaron Fenyes <aaron.fenyes@fareycircles.ooo>
Reviewed-on: StudioInfinity/dyna3#103
Co-authored-by: Vectornaut <vectornaut@nobody@nowhere.net>
Co-committed-by: Vectornaut <vectornaut@nobody@nowhere.net>
