Rain of Pain v1-3: No Pain, No Gain Update!

Rain of Pain v1-3: No Pain, No Gain Update:

• Added red swords that obliterate health on hit, and occasionally explode into multiple swords.
• Added hearts that added health!
• Reworked scoring mechanism, difficulty, and spawning times. Things are going to get nuts!
• Did some unexciting graphical stuff...
• Added ability to reset Highscore with R key.