Mp3tag 2.83

What's new in this version:

New:
- added MP4 column to tag-field mappings overview table in documentation
- added Discogs Release ID tag source to directly search by Discogs Release ID
- added support for ISRC field in cue sheets
- added option to restrict action-based cover export to certain cover type
- added support for stripping Nero-style chapter information from MP4 files via context-menu in the file list
- added support for detecting Nero-style MP4 tags and reporting via %_tag% if present

Changes
- removed Amazon tag sources after Amazon.com invalidated Mp3tag's web services account
- Discogs tag source name is now correctly capitalized
- main performer from cue sheet is now mapped to ALBUMARTIST (instead of ALBUM ARTIST)

Fixed:
- special characters in main performer from cue sheet were not correctly converted when writing
- cue sheets that started with a different track number than 1 were not read
- checkboxes at dialog for cover export were not labeled correctly (since 2.82b)
- tags saved to wrong file when auto-save was enabled and column-click in file list changed the file order
- Discogs Web Source had problems with certain artists which resulted in obsolete comma after artist name
- sort arrow was incorrectly shown for next column after adding or removing a column left from the sort column
- added detection of non-iTunes custom tags which are now kept unmodified during rewrites
- encoding of cover art for Opus did not always include Base64 padding (which was problematic for some players)
- runtime error at Export if loop limit exceeded actual export result set size
- possible index overflow at $substr() scripting function

Languages:
- added Indonesian language file
- updated Bulgarian, Chinese, Czech, Polish and Turkish language files