Allow Partial Units for Page Margin

[edm00se]

Updated the RegExp to allow for more than strictly integer input (e.g.- 0.5in, 0.25cm, 2.5mm).

Tested using RegEx101:

• original RegExp: https://regex101.com/r/xC1wH2/1
• new RegExp: https://regex101.com/r/xC1wH2/2

[ebdrup]

I added you as collaborator on this repo. Feel free to merge yourself :-)

[edm00se]

Your terms are accepted, sir.