Added 32x32 status icon to be displayed in Australis panel and customization palette

Review: http://codereview.adblockplus.org/5741004535627776/

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extra : rebase_source : 3b8e82172253e354fc6e448b069187af8f171d42
Slightly simplified backwards compat toolbar customization code.

Review: http://codereview.adblockplus.org/5741004535627776/

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extra : rebase_source : 93fd14db5bd14e8ebbcc9a884bc6c6d918a02947