Added a sort on the window list select menu to improve usability

I tend to have a number of tabs open at any given time (sometimes 20 or more) and in these cases the window list comes into play to access open files. I use the quick open dialog quite a bit to access most of my files, but a lot of the time I could access open files more quickly with the window list. 

This change simply sorts the tabs that appear in the window menu alphabetically to make it easier to find a specific file that is already open. All references to the correct tabs are maintained and no functionality is lost.