Resolve "Simulate SFG"

Closes #22 (closed) and #24 (closed). This merge will:

• add some important test cases
• implement deep copying of SFG
• implement Simulation
• add Register operation
• refactor operation evaluation to allow for simulation of registers/delays with loops and nested SFGs
• refactor neighbors/parameter/traverse interface by moving it to GraphComponent
• add some convenience functions to Operation
• tidy up the method signatures of some interfaces to be more general
• move bit length specification from InputPort to Signal
• add customization point for specifying input truncation behavior for user operations

changed milestone to %Period 1 Kanban

added Needs testing + 1 deleted label

added 5 commits

• b25d5b30...b8647143 - 4 commits from branch develop
• 356caa76 - Merge remote-tracking branch 'origin/develop' into 24-simulate-sfg

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added 1 commit

• 5fe5e715 - add missing return type annotation for __str__ in SFG

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assigned to @anglo547 and @jacwa448

approved this merge request

Nice job, looks good!

Great job. Looking good for merge.

approved this merge request

merged

mentioned in commit d4ec822b