MacGui: added a new HBTitle class to wraps the hb_tltle_t parts used by the mac gui. Small improvements to the HBCore related classes.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6576 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: switched the hb_handle_t references in HBController to HBCore instances.
Drag & drop to the main window does not work is this rev.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6577 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: moved the main window toolbar to the xib.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6578 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: set the fTitle to NULL before performing a scan.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6579 b64f7644-9d1e-0410-96f1-a4d463321fa5
MacGui: added back some tooltips to the toolbar items. Remove the NSToolbarDelegate protocol from HBController.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6580 b64f7644-9d1e-0410-96f1-a4d463321fa5