Make it possible to have implementations in different toolkits.

Also, make it possible to share the headers.

OGApplication.m

@@ -1,36 +0,0 @@
-#import "OGApplication.h"
-
-OF_APPLICATION_DELEGATE(OGApplication)
-
-extern Class og_application_delegate(void);
-
-@implementation OGApplication
-+ (void)quit
-{
-	gtk_main_quit();
-}
-
-- (void)applicationDidFinishLaunching
-{
-	OFAutoreleasePool *pool;
-	int *argc;
-	char ***argv;
-
-	delegate = [[og_application_delegate() alloc] init];
-
-	[[OFApplication sharedApplication] getArgumentCount: &argc
-					  andArgumentValues: &argv];
-	gtk_init(argc, argv);
-
-	pool = [OFAutoreleasePool new];
-	[delegate applicationDidFinishLaunching];
-	[pool release];
-
-	gtk_main();
-}
-
-- (void)applicationWillTerminate
-{
-	[delegate applicationWillTerminate];
-}
-@end