Update V0.1.0

I've noticed an oversight which caused prices to rise exponentially which led me to work on the game again. Out of one fix became:

• Fix: Price increases are now linear
• Fix: Resolved a bug which caused my debug save data to carry over to release versions
• Changed: Increased prices are no longer stored and instead calculated out of other stored data
• Added: Volume sliders for master volume, SFX and music
• Added another cheat to set the Steamie value
• Removed: Upgrade cost out of tooltips due to it causing me headaches to fix an issue