Add support for record-jar files

[Alhadis]

This pull-request adds support for the record-jar format, the best-known example of which (and the only one with sufficient distribution) is the IANA language subtag registry.

More background on this format can be found at a 7-year old repository of mine, which actually does a pretty good job of explaining it.

Distribution

• 528 code results (harvested here, with most dupes removed)
• 360 repositories
• 274 users

Syntax highlighting samples

• language-subtag-regsitry
• nametable

Origin of sample

Freely distributed by IANA and released to the public domain.

Rationale for colour choice

I picked #0673ba from IANA's logo, because record-jars (like most Unix text-file formats) don't have any "branding" so to speak.

[lildude]

Origin of sample

Freely distributed by IANA and released to the public domain.

Whooopsie, looks like we're missing a commit as there isn't a sample on this PR at the mo 😉

[Alhadis]

@lildude Whoops. Fixed.

[lildude]

Woah! It's hooog!! But I see it's pretty much the same file in every repo.

[Alhadis]

Woah! It's hooog!! But I see it's pretty much the same file in every repo.

Holy hell, why didn't you tell me I was committing a 48,149-line sample??? :| That was supposed to be a cropped version of the database in the order of bytes, not minutes (spent waiting on your browser if you open the sample on GitHub). 😁

I'll make a note to remedy my brainfart later, because a 694.19 KB sample is simply unacceptable. Hell, 69.4 KB would've been unacceptable. Done. See #5272.

Promise me you'll kick my arse if I do that ever again. 😜

[lildude]

Promise me you'll kick my arse if I do that ever again. 😜

Promise 😆