Now providing shared c++ library to be independent from QDBus.

Now providing shared c++ library to be independent from QDBus.
New concept of handling layer in WindowManager.
- Three layer are created statically. One for the HomeScreen app (in the backround), one for applications and one for popups.
- Apps can position their surfaces free in the assigned layout render areas. By default, one render area is assinged to one surface.
Compatible with Qt 5.7
- The HomeScreen MUST create its surface with the id 1000!
- This can be archieved this way:
QT_IVI_SURFACE_ID=1000 QT_WAYLAND_SHELL_INTEGRATION="ivi-shell" ./HomeScreen &
- see https://codereview.qt-project.org/#/c/121297/ for more details

Since the WindowManager uses the IVI-shell, the file /etc/xdg/weston/weston.ini has to be changed:
--------
[core]
shell=ivi-shell.so

[ivi-shell]
ivi-module=ivi-controller.so
ivi-shell-user-interface=/usr/lib/weston/weston-ivi-shell-user-interface

[output]
name=HDMI-A-1
transform=270
--------

The sequence that is used right now to get you started with WindowManager and HomeScreen:

killall weston
export XDG_RUNTIME_DIR=/tmp
openvt -s weston
chown aglglobalapp:aglglobalapp /tmp/wayland-0
su aglglobalapp

export `dbus-launch`
cd /opt/AGL/HomeScreen

./WindowManager &
QT_IVI_SURFACE_ID=1000 QT_WAYLAND_SHELL_INTEGRATION="ivi-shell" ./HomeScreen &

Signed-off-by: Bocklage, Jens <Jens_Bocklage@mentor.com>