Implicitly enabled mods

[curiosity]

When the player enables a mod in the mod manager, all required and disabled mods become implicitly enabled.

When the player installs a mod, any automatically downloaded dependencies become implicitly enabled.

When the player disables a mod (including the implicitly enabled ones), all unnecessary implicitly enabled mods become disabled.

This new mechanic will mean the player won't have to track down every single dependency when they want to disable a mod.