Group genre dropdowns into non-selectable optgroup sections

- Load grouped genre list (music_genres_grouped.txt) with section headings
- Render headings as <optgroup> labels (visible, not selectable)
- Add Disney under CHILDREN'S & HOLIDAY (was missing from grouped file)
- Bump version to 0.9.3

lists/music_genres_grouped.txt

@@ -0,0 +1,294 @@
+ROCK
+Alternative Rock
+Art Rock
+Blues Rock
+Britpop
+Classic Rock
+Folk Rock
+Garage Rock
+Glam Rock
+Gothic Rock
+Grunge
+Hard Rock
+Indie
+Indie Rock
+J-Rock
+Krautrock
+Math Rock
+Neue Deutsche Welle
+New Romantic
+New Wave
+Post-Rock
+Power Pop
+Progressive Rock
+Psychedelic Rock
+Rock
+Rock & Roll
+Rockabilly
+Shoegaze
+Soft Rock
+Southern Rock
+Space Rock
+Stoner Rock
+Surf Rock
+Symphonic Rock
+Trop Rock
+Yacht Rock
+
+METAL
+Black Metal
+Death Metal
+Deathcore
+Doom Metal
+Folk Metal
+Glam Metal
+Gothic Metal
+Heavy Metal
+Industrial Metal
+Metal
+Metalcore
+Nu Metal
+Power Metal
+Progressive Metal
+Symphonic Metal
+Thrash Metal
+
+PUNK & EMO
+Afropunk
+Emo
+Hardcore Punk
+Midwest Emo
+Pop Punk
+Post-Hardcore
+Post-Punk
+Punk Rock
+Screamo
+Ska Punk
+
+POP
+Adult Contemporary
+Art Pop
+Ballad
+Baroque Pop
+Bedroom Pop
+Bubblegum Pop
+C-Pop
+Cantopop
+City Pop
+Dance Pop
+Dream Pop
+Electropop
+Folk Pop
+Indie Pop
+J-Pop
+K-Pop
+Latin Pop
+Piano Ballad
+Pop
+Pop Rock
+Power Ballad
+Synthpop
+
+HIP-HOP & RAP
+Boom Bap
+Cloud Rap
+Conscious Hip-Hop
+Crunk
+Drill
+G-Funk
+Gangsta Rap
+Grime
+Hip-Hop
+Latin Trap
+Lo-Fi Hip-Hop
+Miami Bass
+Phonk
+Trap
+UK Drill
+
+R&B & SOUL
+Alternative R&B
+Doo-Wop
+Funk
+Motown
+Neo-Soul
+New Jack Swing
+R&B
+Slow Jam
+Soul
+
+ELECTRONIC & DANCE
+Acid House
+Afro House
+Amapiano
+Ambient
+Bass Music
+Big Beat
+Big Room House
+Breakbeat
+Chicago House
+Chillout
+Chillwave
+Chiptune
+Dance
+Dark Ambient
+Darkwave
+Deep House
+Detroit Techno
+Disco
+Downtempo
+Drum & Bass
+Dubstep
+EBM
+Electro
+Electro House
+Electroclash
+Electronic
+Eurobeat
+Eurodance
+Future Bass
+Future Funk
+Goa Trance
+Happy Hardcore
+Hardstyle
+House
+Hyperpop
+IDM
+Industrial
+Italo Disco
+Jungle
+Lo-Fi
+Melodic Techno
+Minimal Techno
+Moombahton
+New Age
+Nu-Disco
+Progressive House
+Progressive Trance
+Psybient
+Psytrance
+Synthwave
+Tech House
+Techno
+Trance
+Trip-Hop
+Tropical House
+UK Garage
+Uplifting Trance
+Vaporwave
+
+JAZZ
+Acid Jazz
+Bebop
+Big Band
+Cool Jazz
+Dixieland
+Free Jazz
+Jam Band
+Jazz
+Jazz Funk
+Jazz Fusion
+Latin Jazz
+Ragtime
+Smooth Jazz
+Swing
+
+BLUES
+Blues
+
+FOLK, COUNTRY & AMERICANA
+Acoustic
+Alt-Country
+Americana
+Bluegrass
+Celtic
+Country
+Country Pop
+Country Rock
+Folk
+Honky Tonk
+Indie Folk
+Irish Folk
+Outlaw Country
+Sea Shanty
+Singer-Songwriter
+Western Swing
+Zydeco
+
+WORLD & REGIONAL
+Afrobeat
+Afrobeats
+Bhangra
+Bollywood
+Highlife
+Klezmer
+Native American
+Polka
+Qawwali
+World Music
+
+LATIN
+Bachata
+Bossa Nova
+Corrido
+Cumbia
+Flamenco
+Latin
+Mariachi
+Merengue
+Norteño
+Reggaeton
+Regional Mexican
+Salsa
+Samba
+Tango
+Tejano
+
+REGGAE & CARIBBEAN
+Calypso
+Dancehall
+Dub
+Reggae
+Roots Reggae
+Ska
+Soca
+
+CLASSICAL & ORCHESTRAL
+Baroque
+Chamber Music
+Classical
+Neoclassical
+Opera
+Orchestral
+
+CHRISTIAN & GOSPEL
+Christian Hip-Hop
+Christian Rock
+Contemporary Christian
+Gospel
+Worship
+
+SOUNDTRACK, CINEMATIC & THEATRE
+Anime
+Cabaret
+Cinematic
+Musical Theatre
+Soundtrack
+
+CHILDREN'S & HOLIDAY
+Children's Music
+Christmas
+Disney
+Lullaby
+
+EASY LISTENING & TRADITIONAL VOCAL
+A Cappella
+Barbershop
+Chanson
+Easy Listening
+Lounge
+
+OTHER / EXPERIMENTAL
+Avant-Garde
+Experimental
+Noise