Release v1.4.0

• fix some missing objects errors
• sanitize more playernames in syncgroups
• add sendTo Command "cmdGeneral"
• sanitize more the playername
• improve translation
• if trackartist is avail then write to artist if empty
• improve handling for artwork_url
• move widget documentation from html to markdown
• adjust responsive tab style
• improve attribute widgets
• change TPE2 handling once more
• jsonConfig add sizing options for differenz screen sizes
• test implementation of TPE2 handling. switch in settings
• add datapoints album_artist, track_artist, artistOriginal