Reorder create entries into new desktop context menu submenu

It would be useful to reorganize the 'Create' entries found in the desktop context menu based on how frequent a user would likely use them and place them into a 'Create' or 'New' submenu to keep the menu as small as possible. A better ordering can be found in most DEs and a submenu can be found in KDE, LXQt/LXDE, and Windows. This topic came up in issue #48 (closed).