* 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