youtube-dl 2021.01.24.1

Core

• Introduce --output-na-placeholder (#27896)

Extractors

• [franceculture] Make thumbnail optional (#18807)
• [franceculture] Fix extraction (#27891, #27903)
• [njpwworld] Fix extraction (#27890)
• [comedycentral] Fix extraction (#27905)
• [wat] Fix format extraction (#27901)

• [americastestkitchen:season] Add support for seasons (#27861)
• [trovo] Add support for trovo.live (#26125)
• [aol] Add support for yahoo videos (#26650)

• [yahoo] Fix single video extraction
• [lbry] Unescape lbry URI (#27872)
• [9gag] Fix and improve extraction (#23022)
• [americastestkitchen] Improve metadata extraction for ATK episodes (#27860)
• [aljazeera] Fix extraction (#20911, #27779)

• [minds] Add support for minds.com (#17934)

• [ard] Fix title and description extraction (#27761)

• [spotify] Add support for Spotify Podcasts (#27443)