- Final Output handles (polygon on the right) appear when internal output handles (then and else blocks) are connected.
- position of final output handles fixed

added some comments

Added buttons to add and remove input/output for some nodes, wherever applicable.

- if-then-else & repeat: add/remove quantum/classical input
- merger: add/remove input
- splitter: add/remove output

Added submenu if node has both classical and quantum input, i.e.
Add Input > Quantum | Classical.

Changed "Classic" to "Classical" in Submenu of Context Menu.

Maximum one final output handle per input.

- algorithm nodes (classical & quantum) now have data fields numberQuantumInputs/Outputs and numberClassicalInputs/Outputs
- values can be changed in property panel and via context menu
- preparation for consolidating algorithm and classicalAlgorithm into one node

using property panel to change number of inputs and outputs of custom (quantum/classical) operator fixed. Context menu: adding/removing input/output fixed.

Uniform setting specifiers for experience mode, recommended settings (table) and configuration:
* Ancilla Modeling: On/Off
* Compact Visualization: On/Off
* Completion Guaranteed: Yes/No

Property Panel now shows all choices of arithmetic operators if completionGuaranteed == False.

Categories "Data Types" and "Operators" have different descriptions based on completionGuaranteed

Automatically sets recommended settings when switching Experience levels:
* Explorer: Ancilla Off, Compact Off
* Pioneer: Ancilla On, Compact On

Changed filename from "reactflow-diagram.svg" to "[model name]_flow-[id].svg"

category panel: moved TDG gate up to T gate

* Remove Input/Output only appears in context menu if there are inputs/outputs to be removed
* custom classical operator: only cassical inputs/outputs, minimum number of in/out: 0
* custom quantum operator: both classical and quantum, minimum number of in/out: 0
* merger and splitter: minimum number of in/out: 2
* control structure nodes: minimum number of inputs: 1

added classical inputs & outputs for custom quantum operator

error: deleting custom classical/quantum operator node threw error (white screen).

* switching experience level sets default setting (Ancilla Mode and Compact Visualization)

* removed "numberInputs" fields (and similar fields) for Splitter, Merger, Custom Operators, Control Structure Nodes
* inputs in property panel didn't work, need to be fixed before input fields are added again