Improve comments
New tooltips for selection options
Add a new Select menu to the main window
Fix all menu icons to work with the new Select menu

Also, show/hide the Select menu when some/zero images are loaded
Change form's caption to display development build

As necessary.  Odd minor version numbers will be automatically be marked
as dev builds from now on.
Placeholder text for new Select menu

I've decided it makes more sense for me to add support for Selections in
the Undo/Redo/Macro engine before doing additional Select tool work, so
the Select menu has been placed on temporary hold.