Improve and freeze P-vector reports

[redeboer]

Some left-overs from the todo-list of ComPWA/compwa.github.io#278.

To do

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1. Explain code, particularly DynamicsSymbolBuilder
2. Change color cycle?
3. Render fit process with CSVSummary
4. Widget for starting parameters
5. Parametrize Breit-Wigner with coupling g as well
6. Test coupled fit with resonance mass between threshold
7. Remove i from phase space factor
8. Freeze TR-030, TR-031, and TR-032
9. Improve ratios Argand plots
10. Fix title of TR-032 (coupled channel fit)
11. Generalize TR-032 so it can handle multiple poles