[0.6.16] Fixes + improvements

Reworked saving to be more robust.

• Added 2 levels of saving to ensure data is on disk.

• Added option to manually save from the settings menu.

• Added button on load page to directly load a backup instead of the main save.

• Scan backups on loading game and show the latest save if the main save failed to persist.

Fixed hard crash when loading pre-0.6 saves.

Fixed styling of mastery screen to be better in dark mode, and to be more consistently layed out.

Fixed forgeworks harmony debuff from giving you massive negative perfection.

Added a quick attack button to use the current stance. Also indicate current stance on the fight button.

Improve styling of buttons in dark mode.

Fixed hard crash when using Target: conditionals.

Fixed save importing not defaulting to the most played save.