squashed commits:
- fix unpacking regex matches for dice notation
- fix missing cast to integer
- fix raw result output
- fix formatting of chat message for raw result
- faster dockerfile builds?
- fancier output format
- fix variable name collision
- remove unnecessary newline
- more robust handling of dF
- fix typo
- fix formatting
- use blank character for dF
fix buffered output and missed var name
fix missing comma
change dockerfile to install ffmpeg and dependencies on top of archlinux
fix pacman not syncing
fix pacman not syncing
fix pacman not autoconfirming
fix missing pip
