Backupy

- improve rsync support (does not work with snap package, no plans on fixing)
- new feature: display files lists as collapsible trees with curses
- use the --curses flag to display trees for scans, conflicts, and corruption detection
- type curses at the confirmation prompt to display trees for pending transfers

- fix input prompt to continue when using some terminal multiplexers
- add initial support for copying files with rsync (use flag --rsync, currently assumes copy is always successful, will add error checks later)

- fix statusbar overflow to next line when progress digits increase
- add --nocolour flag

- print total sizes along with number of files and changes before run
- fix crc errors printing twice in scan only mode
- improvements and fixes to experimental log summary

- improved and simplified directory scanning and comparisons
- improved detection of crc errors when using scan only mode
- other minor fixes
- new experimental log format, enable with 'write_log_summary = True' in config