--introduce a new class called level which contains
all the needed information concerning indicator level
and at the same time the bridge that provides information
for the specific indicator states
--in order for all indicators infrastructure to
load the plugin correctly the configuration and
the component elements of ViewPart::Indicator
must be loaded first correctly and afterwards
the relevant Indicators to follow
--indicators now support both Back/Front
layers. Back layer is the usual layer
behind the current Item and the Front layer is
a layer above the current Item (overlay)
--update Unity to follow new architecture
Michail Vourlakos