most of the 2.X->3.0 commit (up to rev 4299) except for gtk2_ardour/editor_canvas.cc; builds and runs and does a few specific things but expect it to be buggy for a while yet

git-svn-id: svn://localhost/ardour2/branches/3.0@4313 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/cocoacarbon.mm

@@ -163,3 +163,16 @@ ARDOUR_UI::platform_setup ()
 	} 
 }
 
+bool
+cocoa_open_url (const char* uri)
+{
+	NSString* struri = [[NSString alloc] initWithUTF8String:uri];
+	NSURL* nsurl = [[NSURL alloc] initWithString:struri];
+
+	bool ret = [[NSWorkspace sharedWorkspace] openURL:nsurl];
+
+	[struri release];
+	[nsurl release];
+
+	return ret;
+}