* Added CSS to treat manage packages icon position.
* Wired up a rough concept showing how I propose to pass a masked-icon class, along with the icon name - derived from the action icon path - to the injected action prior to rendering. The end result is an injected action with an icon which behaves like the others in the notebook toolbar.
* Revert "Added CSS to treat manage packages icon position."
This reverts commit 215a67244a78224fe8fd2e6480b7e50d37a15dc0.
* Revert "Wired up a rough concept showing how I propose to pass a masked-icon class, along with the icon name - derived from the action icon path - to the injected action prior to rendering. The end result is an injected action with an icon which behaves like the others in the notebook toolbar."
This reverts commit 1e0cf116602192aa554334d564e855167b0e8bb6.
* Modified LabeledMenuItemActionItem to add masked-icon class to injected label element.
* Modified LabeledMenuItemActionItem to add masked-icon class and styles for injected label element.
* To prevent conflict with Dashboard, I duplicated the existing LabelMenuItemActionItem and odified it.
* Added comment to new method. Added non-prefixed mask-image style.
* Renamed method and modified comments.
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