Add a singer publish tool to pack a singer into a zip file

[oxygen-dioxide]

Add a singer publish tool in singers dialog to pack a singer into a zip file

• Use UTF-8 encoding for file names when compressing the zip file.
• Optionally ignore engine intermidate files (such as .frq and .llsm)
  
  

[oxygen-dioxide]

The ignored file types declaration use .gitignore syntax
Default:

#Adobe Audition
*.pkf

#UTAU Engines
*.ctspec
*.d4c
*.dio
*.frc
*.frt
*.frq
*.harvest
*.lessaudio
*.llsm
*.mrq
*.pitchtier
*.pkf
*.platinum
*.pmk
*.star
*.uspec
*.vs4ufrq

#UTAU related tools
$read
*.setParam-Scache
*.lbp
*.lbp.caches/*

#OpenUtau
errors.txt