[REFACTOR] Create a dedicated file to store all settings/options

[tbouffard]

Use a central place for all the demo configuration. This will be easier to manage changes to adjust the settings.
Note: there is currently no need to use external configuration file, the configuration is hard coded within the bundle and this is perfectly OK

Settings to centralize

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1. ProcessExecutor: default elements duration time for shapes and edges
2. PathHighlighter: all colors, stroke width used to highlight the execution path/trace
3. popovers: themes, styles, ....
4. ....