rename project to moedict-desktop

Signed-off-by: Rack Lin <racklin@gmail.com>
Added replaced icon stub.

Signed-off-by: Rack Lin <racklin@gmail.com>
removed webapp wrapper xpi

Signed-off-by: Rack Lin <racklin@gmail.com>
removed extensions from moedesktop

Signed-off-by: Rack Lin <racklin@gmail.com>
Added moedict-app as submodules

Signed-off-by: Rack Lin <racklin@gmail.com>