convert MainActivity to Kotlin and upgrade MaterialDrawer to version 8 (#1748)

* convert MainActivity to Kotlin

* migrate to MaterialDrawer 8

* fix drawer styles

* revert removing BezelImageView and material_drawer_header override

* fix tests

* add lost comment back to material_drawer_header.xml

* add tools:parentTag to material_drawer_header.xml

* use when instead of if in MainActivity

* fix statusbar color over the drawer

* cleanup drawer item creation

* tint secondary drawer items as well

* remove unnecessary ids

* fix header text color in the light theme

* improve header text contrast

app/src/main/java/com/keylesspalace/tusky/components/search/SearchActivity.kt

@@ -121,7 +121,6 @@ class SearchActivity : BottomSheetActivity(), HasAndroidInjector {
     override fun androidInjector() = androidInjector
 
     companion object {
-        @JvmStatic
         fun getIntent(context: Context) = Intent(context, SearchActivity::class.java)
     }
 }