converters/convmv: update 2.03 -> 2.05

• allow NFC/NFD conversion on APFS volumes, add man page section for that filesystem
• use case- and normalization-insensitivity workarounds also for parsable mode
• check for valid utf-8 also in upperlower_checkenc()
• fix parsable output, missed the path files to run utime() on
• add --run-parsable option to blindly run what a file generated with --parsable tells us to do

PR: 235990
Submitted by: kcwu@csie.org (maintainer)