Fix memory leaks detected by Valgrind

Fix memory leaks detected by Valgrind

Fixes the following memory leaks reported by Valgrind
that can occur when messages with raw pointers are sent
from event -> update (and update -> render)
and dali shutdowns before update or render has had chance
to process those messages

- AddSampler ( sampler is lost )
- AddPropertyBuffer ( property buffer is lost )
- SetPropertyBufferFormat( property buffer format is lost )
- AddGeometry ( geometry data  is lost )
- AddTexture ( texture data is lost )

event -> update
- AddCameraMessage ( Camera is lost )
- AddObjectMessage ( Object is lost )
- AddPropertyNotificationMessage ( PropertyNotification is lost )
- AddGestureMessage ( PanGesture is lost )
- AddSamplerMessage( sampler is lost )
- AddPropertyBuffer( property buffer is lost )
- SetPropertyBufferFormat( property buffer format is lost )
- SetPropertyBufferData( property data is lost )
- AddGeometry( geometry is lost)

Also removes PropertyBuffer data and format from being duplicated
on the event side.

Change-Id: Iac6d446bd2b5372cea7ec101e2e289ef3f284b4c