Nyall Dawson ad944156c8 [feature][layouts] Add menu entry to add dynamic text labels
easily to a layout

The new "Add Item" -> "Dynamic Text" menu contains a bunch of preset
handy dynamic text expressions which users can use to insert a label
automatically containing the corresponding expression. E.g.

Add Item -> Dynamic Text -> Layout Name

will insert a label containing the expression [% @layout_name %].

This raises discoverability and user-friendliness of inserting
dynamic labels
2021-01-12 04:32:19 +10:00
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