add macros that turn unit from cm/mm/in to px #5066
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Description
It can be useful to be able to define the size of plots in other units.
Therefor these macros convert the tuple of size in px before the size tuple is evaluated by the function.
Attribution
Things to consider
It shouldn't affect anything since the macros are executed before the tuple is transferred to the plot function.
Considerations
I have seen that other values like left_margin are implemented by the Measure package.
To apply this method to the plot size the changes would have more impact, because the pixels unit needs to be recalculated for the selected DPI value after receipt.