Add upper case and title case support

[kkaefer]

Seems like the data already contains upper case and title case mappings?

[kkaefer]

Why is

miniutf/preprocess.py

Line 404 in 5cbd56b

# "upper_offset": make_translation_map("uppercase_offset", lambda info: info.uppercase - info.codepoint if info.uppercase else 0),

commented out?

[j4cbo]

Perhaps too late to be useful, but just for completeness...

We only implemented lowercase because that's all we had need for internally, and wanted to save on binary size as much as possible. Adding upper/titlecase as a config option (#define maybe?) would be an option, but leaving them out was intentional.

[kkaefer]

For reference, we switched to https://bitbucket.org/alekseyt/nunicode