Move manager files in Models folder to Simulation class (folder)

[ShahzaibAhmad05]

• Involves:

  • Commands.cs
  • ComponentManagers.cs
  • PreviewManager.cs

• All of these should be moved back to the Simulation partial class

• This saves us passing infinite arguments to public functions of those classes

• Simulation class is actually a folder now

[ShahzaibAhmad05]

@d-khalid comments? (if any)

i mean this is still just a PR, if you don't want this to be done just say it