QArrayDataOps: generic array operations

QArrayDataOps: generic array operations

This class, the selector and underlying implementations provide
specialized operations on QArrayData, while allowing for optimized
implementations that benefit from type-specific information.

Currently, offering a generic implementation and specializations for
PODs (trivial ctor, dtor and move operations) and movable types (can be
trivially moved in memory).

Change-Id: I2c5829b66c2aea79f12f21debe5c01f7104c7ea3
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>