Fractalistic

Fixed
- Bug with state loading

Added
- multithreading (multiprocessing)
- `--threads/-t` option
- `threads` command
- screenshot threads (also command and cmdline option)
- A lot of new bugs for sure...

Improved
- Code quality (a lot)

Added
- Load and save state commands
- `-ls/--load-state` option

Fixed
- 30 screenshots wrongly centered

Added
- `precision` command

Fixed
- Fixed 17 - Custom numeric precision not taken into account

Added
- Average divergence
- Allow cancelling screenshots
- `move_dist` command
- Value control commands without args now print out the current value
- `zoom_lvl` command
- `pos` command
- Show zoom level in canvas border subtitle
- `click_pos` command

Fixed
- Some errors in help messages, and better formating

Fixed
- Fix random error at startup