Commits on Sep 20, 2021

1. Add PDF_TO_CSS_UNITS to the PixelsPerInch-structure …

   Rather than re-computing this value in a number of different places throughout the code-base[1], we can expose this in the API via the existing `PixelsPerInch`-structure instead.
   There's also been feature requests asking for the old `CSS_UNITS` viewer constant to be made accessible, such that it could be used in third-party implementations.
   
   I suppose that it could be argued that it's somewhat confusing to place a unitless property in `PixelsPerInch`, however given that the `PDF_TO_CSS_UNITS`-property is defined strictly in terms of the existing properties this is hopefully deemed reasonable.
   
   ---
   [1] These include:
    - The viewer, with the `CSS_UNITS` name.
    - The reference-tests.
    - The display-layer, when rendering images; see PR 13991.

   

   Snuffleupagus committed Sep 20, 2021
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