1.2.3 release

Deployed at https://pypi.org/project/ttconv/1.2.3/

What's Changed

• Fix SCC NDF timecode drift: parse at FPS_29_97, fix add_frames() DF flag by @powelli in #506
• Error on zero ttp:cellResolution components by @palemieux in #520
• Raise an error on negative tts:lineHeight by @palemieux in #519
• Log an error when parsing an empty tts:position by @palemieux in #522
• Improve parse_color() error reporting by @palemieux in #521
• Improve time expression parsing by @palemieux in #523
• Fix style inheritance in VTT and SRT writers by @palemieux in #518
• IMSC reader: accept all(...) syntax in ttp:contentProfiles by @Sanjays2402 in #524
• imsc_reader: remove the spurious requirement that style element must have an id by @palemieux in #529
• imsc_reader: ignore style elements with no id for referential styling resolution by @palemieux in #531
• model: allow empty ruby element by @palemieux in #533
• srt_reader: handle unbalanced and mismatched tags by @palemieux in #539
• srt_reader: handle empty cues by @palemieux in #541
• SRT Writer: add a unit test for LWSP-only lines by @palemieux and @youdie006 in #543
• VTT Reader: handle WebVTT files with bad signatures by @palemieux and @eeshsaxena in #536
• Remove use of dataclasses._MISSING_TYPE by @palemieux and @eamanu in #546

New Contributors

• @powelli
• @Sanjays2402
• @youdie006
• @eamanu
• @eeshsaxena

Full Changelog: 1.2.2...1.2.3