User:Mzajac/Script template cleanup

I'm compiling information about the pronunciation, script, and transliteration templates which apply font styles here, in preparation for a clean-up.

The language subtag column is my best guess at the correct representation per 4646. I've used “xx” to represent whichever primary language tag belongs in an instance, but per the standard, most languages with a default script (“suppress-script”) should not normally indicate it. Subtags following “x-” are correctly formed private-use subtags which I've formulated.

Please add and correct the data.