Restructure: Move header files from Src to Inc

:Release Notes:
Restructure code by moving the header files from the Src folder to a new
Inc folder, providing a separation which is more appropriate to a
component with so many source and header files.

:Detailed Notes:

:Testing Performed:
Built

:QA Notes:

:Issues Addressed:

Open-webOS-DCO-1.0-Signed-off-by: Roger Stringer <roger.stringer@lge.com>

Change-Id: I75d71d05a96b87093f3b8e541bfdaaf9cbd3d50c
Reviewed-on: https://g2g.palm.com/3554
Reviewed-by: Build Verification
Tested-by: Roger Stringer <roger.stringer@lge.com>
Reviewed-by: Igor Kuksyuk <ikuksyuk@luxoft.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>