Consider allowing toolbar items for menu plugins

[GoogleCodeExporter]

Currently only tab / main plugins can have toolbar items because they 
tab-context specific.

However, it may be useful for menu plugins to also have toolbar buttons for 
quick access.

This may be accomplished by having these toolbar items display at all times 
regardless of the tab selected.

Probably the best location would be in the __init__ method of the menu plugin.

Additionally, documentation needs to be added to the plugin development guide 
for toolbar items for both tab and future menu plugins.

Original issue reported on code.google.com by bastula on 15 Aug 2011 at 12:58

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