Enable -Wall -Werror in libs/input. Mask warnings from Skia. Change-Id: I0deeffde07fcf3a09eadec2852e9bf5666b55ee8
Refactored the directory structure so that services can be optionally excluded. This is step 1. Will be followed by another change that makes it possible to remove services from the build. Change-Id: Ideacedfd34b5e213217ad3ff4ebb21c4a8e73f85