Refactor menus

[jarvisteach]

Need to put some work in on menus (and shortcuts specifically #298, #146, #145 )

• [x] Make shortcuts code simpler, leave it up to user to get it right, rather than trying to fix mistakes
• [x] Combine backend .bindKey() code with shortcuts code (see #488)
• [x] Include in simple appJar - app.menu() should create a new menu item & app.menubar() should create a whole bar (#235)
• [x] Work on icons & images (#145)
• [ ] Remove from widget store (#325) or implement widget store refresh, without losing menu/shortcuts
• [x] Ability to hide/remove menu options (#339 & #467)
• [x] Disable menu and associated shortcut (#486)

[jarvisteach]

Accelerators/shortcuts moved into own class.

There is some inconsistency around disabling of menus that needs investigating - what happens when a submenu is disabled, does it get tall items in that sub?

[jarvisteach]

Resolved cascade on disable/enable.

There are issues on rename & delete:

• deleting menus doesn't always delete their entry in widget manager (especially if submenus)
• deleting a submenu will not remove shortcuts - needs to use same cascade code
• there is an issue with menus with a number for their name, tkinter assumes it's an index, and it breaks!

[jarvisteach]

simpleAppJar create function included: .menu(), will not include .menubar()

Needs to work to make it get/set - requires easy way to lookup a menu item...

[jarvisteach]

WidgetManager

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• topLevel (.createMenu() & rightClickMenu) adds an entry to WIDGET_NAMES.Menu
• subMenus (.addSubMenu()) adds an entry to WIDGET_NAMES.Menu
• items are added to the menu retrieved form WidgetManager
• cb & rb - VAR is also created and stored in WidgetManager.VARS, using title+cb/rb+item