3.0.0-RC

This is a pre-release in order to get some in field testing. Since this is a major re-write, I want to give a week or two of usage, bug fixing, feedback before going live with a production ready release.

This is a Major point release, meaning it has breaking changes.

The library has been completed transitioned over to Kotlin, but with the intention of having it as easy to use as possible on either Java or Kotlin. That being said, some heavy underlying changes were made in order to optimize things for Kotlin (without making any sacrifices on the Java end)

The builder has been entirely removed. This allows for creating a Non-Nullable val object of the FragNavController, as the only things required for initializing the controller are the Container (this should never change) and the fragmentManager (ditto). Everything else can be set as pleased and will be correctly initialized using the initialize function. The secondary benefit to this is that if you are using a single Activity, and need to change the tab structure, you can set things on the fly and just call the initialize function when needed.

Please refer to the sample app for suggested best practices, and I will be updating the readme as well as taking feedback over the next couple weeks.