Brick Away - 0.2.0: Powerup rework

This version features a complete overhaul of the powerup system!

Powerups can still spawn in the level, awarding a free powerup upon destruction. Now you can also buy the powerup you want if you've got the gold required. Gold is gained by defeating bricks that spawn in the level.

In addition, multiple powerups can now be active at once. Do you want to go all out and stack extra power with twinned shots, with the bounce modifier? Or do you prefer using the powerups more sparingly to get out of a tricky spot? Mix and match to suit your needs!

In addition, some spawn balance tweaks have been done, and some bug fixes as well :)

There are still a couple of gameplay features planned, as well as a extensive polish & balance fixing phase, including even better (profesionally made) graphcis!