Still refining the gear system, and a few other additions.

- Shops should now kinda work, although the only 2 shops that currently have items in them are the shops on stage 4 and stage 24. I'll be making placeholder art to start populating all the other shops

- Replaced the "Return to Menu" button with an icon. You can also hit Escape to bring up the exit menu.

- Removed redundant auto saving. Game will now only save when you hit the "Save and Return to Menu" button. (Still need to fix the other button for Save & Quit. Will also be adding auto save at timed intervals.)