Investigate other encoding detection options

[pedrolcl]

Currently, we use uchardet to detect lyrics encoding. This library is a (not very well maintained) fork of Mozilla's chardet. Alternatives:

• ICU CharsetDetector. There is a PoC available.
• Rust chardet is a Rust version of Mozilla's chardet, but it is even less well maintained than uchardet.
• Google's compact encoding detector. This one is used in Chrome.
• Rust chardetng which is the new detector in Firefox.

The problem with most of the above alternatives is that the web requirements may not be the same as MIDI lyrics.