[Enhancement]: Refactor some config options to be internal

[originalnicodr]

Describe the new feature or enhancement

There are some options that were made non-internal when created because making them so would have meant parsing them manually and doing extra work. The options in question are the following:

• Default_Freecam
• Custom_Components_To_Disable
• Preferred_Target_Camera

Currently, they appear in the options menu, and the user shouldn't interact with them. So we should either make them internal and see how we can save them, or refactor the ConfigManager to allow such settings without showing them in the options menu.