Move class BinaryContent into its own file.

Prepare for QTIFW-292 and QTIFW-345.

Change-Id: I938b5aa728e8f81eb9521df5753ad80ac630d96e
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>
Make the marker and the find function class members.

Prepare for QTIFW-292 and QTIFW-345.

Change-Id: I065366742d28e72bc5ae55e70eabf6532b809fea
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>