Update to AndroidX

[AllanWang]

This will be a pretty hefty update, as a lot of APIs will change.

Firstly, this is blocked by all of KAU's dependencies, which each must first update to AndroidX. It looks like it will be possible very soon.

As the new version rolls out, I would like to also take the time to fix a lot of problems. Changes are already being introduced, with the help of ReplaceWith where possible. I want to take it a step forward and remove deprecated methods by the new version

With the introduction of coroutines, Anko will likely be removed as a dependency

With the updates with MaterialDialog, colorPicker may or may on live on. This is dependent on how much or how little MD supports it

I may or may not add Android KTX