html-preview: add shortcut for html preview
This adds an ctrl+alt+p shortcut like we used to have a long time ago. However, due to a bug in the shortcut controller dispatch in libdazzle, it does not current activate unless it is set to global (which we do not want). We'll have fixes coming to libdazzle shortly. Additionally, it would be nice to register the command with the shortcut manager so that we can get automated UI in the shortcuts window, but we need to figure out how to do that from Python first.
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