Add Calamares OEM support

Merged Ghost User requested to merge oem-calamares into master

This adds the needed changes to implement Calamares OEM setup for our non-mobile GUI editions.

Minimal and Server editions will still use the OEM TUI and our Mobile editions still use their own setup stuff.

This also increases the extra space used in images from 300 to 600 MB.

Signed-off-by: Dan Johansen

Edited by Ghost User

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