Added memory pool logging

Added memory pool logging

Added methods to fetch the current capacity of memory pools
Added a method to Core to dump the capacities to the log output
(This is triggered by setting DALI_MEMORY_POOL_INTERVAL to a non-zero
value)

Added logging to PixelData to log individual allocations (By setting
DALI_LOG_PIXEL_DATA_SIZE to "1" or higher and enabling debug).

Added method to PixelData to log total allocation (By setting
DALI_OBJECT_PROFILER_INTERVAL to a non-zero value and enabling debug).

Change-Id: I45220005a652ca978ea552dd93564bedad784ba7