Add support for script reordering

[KL-7]

CLDR 21.0 uses a new concept of script reordering that allows putting native scripts (e.g., Cyrillic for Russian) before Latin characters.

This feature changes the sorting order of native and Latin characters, causing TwitterCLDR to fail some of the tailoring specs.

It's probably not a critical issue, because script reordering changes sorting order of scripts relative to each other and not the order of separate characters inside a script, but still it'd be nice to support this tailoring feature in TwitterCLDR.

[camertron]

That would be great, considering this is blocking an upgrade to parity with ICU 52. Any idea how much time it would take to implement, @KL-7?

[KL-7]

@camertron, not yet. I read only the general description of script reordering, so I'm not sure what is the best way to implement it in TwitterCLDR. It depends on what characters and, more importantly, how many of them are moved in the sorting table after script reordering is applied.