ENH: moving old ImageRegionSplitter to Deprecated Module

Updated all current code to use the new virtual splitter interface.

Move the old splitter classes into the deprecated module, along with
their tests.

Updated all tests to use the current splitter. The prior patches
demonstrated backwards compatibility that these tests were still
working with out changes, with the new interface.

Change-Id: Id7985c69828c88e4b78740e51430299c57ba528f
Merge topic 'ConsolidateImageRegionSplitting'

3c5b033 ENH: moving old ImageRegionSplitter to Deprecated Module