added some icons:
ttt_scarisland_withframes_a4
ttt_trappycottage_b3

added ttt_fiskara_v3 and optimized the size of some icons

added some icons:
ttt_winterholiday1
ttt_twisteddreams_v3
ttt_minecraft_b7_summer
ttt_terrortown_smaller

optimized the size of some icons even further

added and optimized the size and the visibility of some icons:
ttt_007_facility_gmn_v2
btec
ttt_abandonedsubway
ttt_brooklyn
ttt_cipher
ttt_craftroom_v4
ttt_cyberpunk_wickford
ttt_devoz_v4
ttt_foundation_v2
ttt_mc_dust2_r
ttt_oldruins
ttt_pelicantown
ttt_pietsmiet_castle
ttt_reinhard_city
ttt_rpgvillage
ttt_skybreak_v1
ttt_submarine

added some icons:
ttt_canyon_a4_winter
ttt_hairyhouse_winter
ttt_islandstreets
ttt_minecraftcity_snow
ttt_terrortown_winter
ttt_winterbetrayal

added ttt_whitehousev3

updated addon.json file

added and optimized the size of some icons:
ttt_cryptic_keep_v6
ttt_moon_b3
ttt_clueless_rv
ttt_matte_v3
ttt_ile_v4
ttt_icevault_a3
ttt_deepsea
ttt_the_room_christmas
ttt_illegalantiquities
ttt_at_lie_ntis
ttt_dwarfhole
ttt_laundry
ttt_dong

added ttt_courtyardredux and ttt_minecraft_b5c