* Match old DataPack behavior when overwriting data
* Make RemoveItem more flexible
* Ditch implied RemoveItem behavior & asher fixes
* KyleS nits - but fixed before he says them
* Add back implicit behavior
* Update CDataPack.cpp
Committing to the spec.
* Update CDataPack.h
* fixup removing last item if explicitly requested
* Fix logic for accepting pack pos, rather than index
* Fixup IsReadable
* headache is over now
* Migrate CDataPack from a Cassette Tape.
Tested-By: Headline22.
* Remove last IsReadable param pass.
* populate len still if CDataPack::ReadString is unreadable or the wrong type.
* Fyren Fixes(TM)(R)(C).
* Deprecate IDataPack.
