Added koin, databinding and navigation components

Converted App class and Main activity to Kotlin. With that refactored fields within App class to allow lazy initialization

BEWARE: at this point the navigation is very much broken, won't let you anywhere beyond home screen

app/src/main/java/com/topjohnwu/magisk/di/ApplicationModule.kt

@@ -0,0 +1,11 @@
+package com.topjohnwu.magisk.di
+
+import android.content.Context
+import com.skoumal.teanity.rxbus.RxBus
+import org.koin.dsl.module
+
+
+val applicationModule = module {
+    single { RxBus() }
+    single { get<Context>().resources }
+}