Clean up Simulations-class.R

[danielinteractive]

To do:

Clean up in below steps by separate PRs (to avoid too large PRs).

Here we mostly need:

1. clean up and harmonization of the format (compare top of the file where things are clean already)
2. change from camelCase to snake_case for class slots - note that we then also need to do this consistently across the downstream methods
3. addition of tests
4. addition or clean up of examples

When somebody takes a task please put your name next to it (edit this description) so we don't duplicate any work :) thanks!

• GeneralSimulationsSummary @pengguanya #777
• SimulationsSummary @pengguanya #779
• DualSimulationsSummary @pengguanya #780
• PseudoSimulations @pengguanya #781
• PseudoDualSimulations @pengguanya #801
• @pengguanya PseudoDualFlexiSimulations #833
• PseudoSimulationsSummary @pengguanya #835
• PseudoDualSimulationsSummary
• DASimulations