To Do List for gLabels 4.0 -- 2018-04-15
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Add "User Variables" feature
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* Add page to MainWindow to
    - Define variables
    - Set their initial values
    - Control how they might increment (per item instance, per item copy, per page)

* Save as part of glabels project file


Add support for arbitrary label shapes
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* I.e. similar to an SVG path.


Add support for "Continuous Roll" labels
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* If product template is for a continuous roll, define a mininum and default length
    - This determines h and dy

* Add option to Properties page to adjust this value


Write help documentation
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