Add tool to automatically generate applications submenu for Apple menu

[morgant]

Currently, the Apple menu items need to be manually added per-theme. This can be tedious, especially after installing new applications and finding/making appropriate 16x16 XPM icons for applications that don't already have "styles" implemented in mlvwmrc. It'd helpful to have a tool that can automatically generate an application menu file to be included in the Apple menu.

There are some scripts out there that can automatically generate application menus for mlvwm, including:

• menubuilder.lua (lua)
• mlvwm-menu-script (shell)

Also, MenuMaker (python) could be updated to add mlvwm support.