Maintanence release

• mp3: Fix potential crashes when deleting tags from MP3 file
• m4a: add missing date handling
• all: modify track (dropping -K for track total) handling, merge date handling with -y, -P property editing observes chain order (end chain listing shows modified properties), audio hash reporting
• build: automake fixes to support Ubuntu 22
• misc: code/compilation warning cleanup

May minor release

New features:

• -w add artwork
• -K disc number

Bug fixes:

• handle readonly files correctly
• common property tags listed (for use with -P)
• validation on numeric inputs

multibyte property handling

Bug fixes:

• setting properties via -P would incorrectly handle multibyte strings
• warnings sent to stderr so pipeline processing (ie with jq) will not fail when we encounter errors (files we can't read etc)