Release v1.3.0

[v1.3.0]

Added

• FFMPEG_PATH may now point directly to the FFmpeg executable, in addition to a directory containing it
• FFmpeg executable is now searched on the system's PATH if it is not found at FFMPEG_PATH or the default /utils/ffmpeg location

Changed

• Common failures (missing ffmpeg, no file selected, no frames extracted) now exit with an error message rather than a traceback

Fixed

• Fix default /utils/ffmpeg location resolving relative to the package directory rather than the project root
• Intermediate frames are now written to a uniquely named temporary directory, rather than <dest>/frames
• Intermediate frames are now cleaned up if conversion fails
• The Tk root window is now closed once the file selection dialog is dismissed