Merge branch 'stickers' into 'master'

README.md

doc/lkt.1

inc/common/macro.h

inc/lektor/commands.h

inc/lektor/database.h

meson.build

src/commands.c

src/database/disk.sql

src/database/find.c

src/database/playlist.c

src/database/queue.c

src/database/stickers.c

src/database/update.c

src/database/user.c

src/main/lkt.c

src/main/lktadm.c

src/module/module_sdl2.c

src/module/module_x11.c

src/module/mpv.c

src/net/downloader.c