Generic Zombie Shooter - Redux v1.2.1

This is a minor release with some day-0 bug fixes that were a result of me releasing v1.2 too quickly.

• Improved Console
  • Added command history so the player can use the arrow keys to scroll through previously used commands.
  • Added optional argument to help command so you can print more information about specific command by typing "/help commandName".
  • Added "wave" attribute to /set command so that the wave can be set.
  • When leveling up via the console, the level up sound no longer plays, as it was stacking for each level up and was generally annoying.
• Fixed piercing projectiles so that they do not hit the same enemy twice.
• Adjusted projectile lifespans so they do not go as far. Low-powered weapons, such as the Beretta, now only travel a short distance.
• Changed the Max Ammo button in the shop so that instead of requiring you to fill the weapon completely -- if you don't have enough money to buy the max amount, it will instead let you buy as much ammo as you're able to afford.
• Fixed issue with Shadow Opacity menu crashing due to wrong image being loaded for zombies.
• Fixed issue with shop not being properly reset if the player returns to the main menu from the game and starts a new game. This meant that weapons unlocked in the previous playthrough couldn't be unlocked in the new one.
• Changed draw location of the Aberration's tentacles so they actually appear from beneath him and extended their reach.
• Fixed Stitches' hook so that it can actually reel the player in, as opposed to the player being able to move around semi-freely while attached.
• Some damage types, mainly the Gasbag's poison, had not been properly converted to the new d20-based damage system, and have been converted now.
• Fixed issue with improperly resetting the Enemy Controller if returning to main menu and starting a new game that was causing the console to not be able to spawn enemies (among other possible side effects).
• Refactored usage of Dice class throughout the game so that Dice objects are static as opposed to instantiating a separate instance for each enemy/weapon/etc. All the Dice objects had the same parameters for each class, so it was just needless memory overhead.

I may do more small bug-fix releases like this in the future to avoid situations like this.