Use bbx prefix for shared code

buffyboard/command_line.c

buffyboard/config.c

buffyboard/config.h

buffyboard/cursor.c

buffyboard/cursor.h

buffyboard/cursor.png

buffyboard/lv_conf.h

buffyboard/main.c

shared/cursor/cursor.c

shared/cursor/cursor.h

shared/cursor/package-lock.json

shared/cursor/regenerate.sh

shared/fonts/font_32.c

shared/fonts/regenerate.sh

shared/indev.c

shared/indev.h

shared/log.c

shared/log.h

shared/theme.c

shared/theme.h