Alpha 1.8 - Enemy variety and basic player progression

-Added multiple new enemy types 

    -"Normal" enemies got general improvements to their AI. They no longer just choose attacks at random, but will be more aggressive at high HP and less aggressive at low HP.

    -"Aggressive" enemies will spend all their energy at once and then retreat to recharge and repeat. This means they have smaller windows of opportunity for you to safety attack them.

    -"Gunner" enemies are equipped with handguns, and can attack from any range and do massive damage. However, they have no martial arts training and are slow to maneuver, meaning if you get close to them, they should be easy kills.

-Rebalanced upgrades

    -Vampirism now heals 3% + 1% per level, old was 10% + 5% per level

    -Colossus style now reduces a flat 10 + 5 per level, old was a 1/(colossusLevel) multiplier to damage taken

    -Snake style buffed to 10 + 5 per level, old was 6 + 3 per level

    -Explosive style now deals only 3% damage + 1% per level, old was 10% per level

    -Lightning style now reduces energy cost by the same as attack speed increase (ex: 2x attack speed = 1/2 energy cost)

-Added lifetime stats tracking

-Everything except muay thai and acolyte are locked by default, each with a different way to unlock

    -TKD: 100 leg kills 

    -Wing Chun: 100 arm kills

    -Trickster: 500 lifetime poison damage 

    -Brawler: 5000 lifetime damage taken 

    -Boxer: 500 lifetime arm attacks used 

    -Assassin: 300 lifetime kills 

    -Tank: 1000 lifetime colossus damage reduced

-Fixed erratic enemy movement from previous versions, where distanceToPlayer was measured by the follower instead of the ghost, resulting in 2s of movement delay instead of the intended 1s

-Added music volume slider in options page 

-Fixed physics issue where ghost/physical enemy did not match up and would cause erratic movement

-Notification for unlocking things

-Small UI updates

-Fixed some animations