[GUI/Scenario file] Add scenario dependent view settings
Currently, the view settings in the GUI topography creator or the postvis are defined by vadere config. This can be annoying if, e.g., a certain color scheme such as coloring by group should be applied only to a certain scenario within a vadere project, but one has to switch very often between different scenarios. Then, one must re-define the settings each time a new scenario with different settings is opened. To avoid this, one could introduce a scenario-specific config for the view settings. By default, the config should be the global vadere config.