[WIP] Fully convert project to Kotlin #413
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This PR converts all Java source files to Kotlin. The initial pass was done with Android Studio's automatic converter with manual changes made afterwards to fix errors and improve nullability indicators. Some code paths were also changed to better work with Kotlin.
I did some testing, but I'm sure there are bugs or unintended behavior changes I missed, so I'm marking this as work-in-progress and hoping to have others help test it.
The new codebase is also not API-compatible with the old version. Some of the changes can be tweaked so generated Java setter names match what they used to be, but Kotlin consumers will have to change to property access syntax, and the way Kotlin's generics work required adding more generic types to some classes.