PathSim - A System Simulation Framework

Again some minor updates and fixes

Refactors

• renamed utils.debugging to utils.analysis since its not only used for debugging anymore
• Timer context manager is more concise
• Special operator input for Adder more robust for weird cases

Serialization

• more robust serialization, saves module of blocks and PathSim objects
• more robust deserialization, uses importlib to import block from saved module if available, otherwise falls back to hierarchy traversal to ensure backwards compatibility for models saved in previous versions

Fixes

• fixed linearization of dynamic blocks with only a single state by checking if engine exists
• fixed jacobian of dynamic operator of Differentiator