* GormCore/GormResourceManager.m: Add code to handle
image/sound/header files.
* GormCore/GormDocument.[h,m]: Add -viewWithTag: method.
* GormCore/GormClassEditor.m: Remove dragging destination code
for resources.
* GormCore/GormResourceEditor.m: Ditto.
* GormCore/GormObjectEditor.m: Ditto.
(addObject:): Change the editor to the GormObjectEditor.
* GormCore/GormDocument.m: Register the window for dragged types.
Implement -viewWithTag:.
* GormCore/GormDocumentWindow.[h,m]: New subclass of NSWindow which
handles drag and drop to GormResourceManager.
* GormCore/GormDocument.gorm: Set the main document window to a
GormDocumentWindow class.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/apps/gorm/trunk@24129 72102866-910b-0410-8b05-ffd578937521