Refactoring of libwebos-gui as EGL platform: impacts libhybris, libwebos-gui, qt-webos-plugin, lsm and wam.

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
webappmanager: add support for a500 machine

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>