private-use.dat: remove all private tags

The current tags are inconsistent and don't align with ISO 3166-2.
Therefore, the tags are being redesigned.
private-use.dat: add the wales private tag
private-use.dat: add cardinal direction tags
private-use.dat: add central cardinal direction tags
private-use.dat: add English regions
private-use.dat: add the england private tag
private-use.dat: add American regions
private-use.dat: add Vietnam regions
private-use.dat: Ceremonial counties of England
private-use.dat: add short and long number scales
private-use.dat: add accent/dialect names
Merge branch 'private-use-tags'