Since this is intended to be template code upon which to build a full
application, I didn't like that the prior license required the full
license text to be reproduced in distributions.

I want the code to be a base for developers to use when starting a Cocoa
application, like the template code that's generated in a new Xcode
project. As such, I want people to be allowed to remove my license when
distributing the code.

Set a BSD-3-Clause license on all the application code so that it can be
freely used as a base template for an application.

Use the GNU GPLv3+ for the log script as it's a helper utility that
isn't compiled into the application.

Make the window's `contentView` the `_scroll_view` so that resizing the
window causes the scroll view to resize with the window instead of
having a fixed size.

Originally, I hoped to include the application name from the Makefile at
compile time, but that ended up being thorny due to application names
with spaces and escaping concerns. Then I tried putting the application
name in a constant, but didn't like that this required duplicating it in
yet another place.

Ultimately I've decided to stick with what I had originally, getting the
application name at runtime from the bundle's Info.plist dictionary.

Switch to a constant-stored application name from the Makefile-defined
one. This makes it easier to render the application name without
worrying about escaping differences between the Makefile and
Objective-C. But I still don't like it compared to what I had before.

This isn't working with the spaces handling. Not sure if I want to keep
going with this approach as it feels like spaces and escaping is going
to get hairy to deal with.

Now that we've confirmed that the "Open Recent" menu item is inserted
automatically below the "Open" menu item in document-based applications,
we can safely remove our custom one from the File menu.