Refactor Sermons Module to use Redux

The sermons module is built using an MVVM architecture. Clearly, Redux is the way to go. So, this refactor should accomplish the following:

• Rename MainActivity to SermonsActivity
• Change the in-app experience from MVVM to Redux (do not change the Android Auto service architecture, yet)
• Use Conductor as the activity/fragment library
• Use Koin for DI
• Import all necessary libraries (or move them to the base module)