Refactor and remove "custom" components

The custom subdirectory doesnt make much sense for
desktop and adds an uneccessary abstraction layer.

This patch removes it and removes some of the properties
that are no longer required.

Change-Id: I65c44db54f6f97bbc1e69d85d35d55464dac794e
Reviewed-by: Gabriel de Dietrich <gabriel.dietrich-de@nokia.com>