Multiple Save/ Quality of life haul

Added the capabilities of having three separate save files for players to try different builds and save progress when restarting to see gameplay changes. Alongside this also look forward to enemy changes, drop rate changes and some improvements to the ingame UI. Looking forward to the Feedback. Next Quality of life improvement I was advised to look into was having a music slider for adjusting in game music. That will be my next goal and from there I should be adding a new area, two new sidequests and a new enemy type.