Adding the gold flower

[Dynamotivation]

This fork of the engine adds in the gold flower powerup and it's functionality.

• Goldballs explode and activate surrounding blocks, bricks get turned into coins
• The powerup is lost after touching the flagpole and Mario reverts back to the fireflower
• All required sprites are added and taken from awesomezacks smb3a powerupsheet

Also because I made this fork with the latest gamemaker studio 1.4 version there are many changed lines which I didn't edit. (GM stuff like loading images)

Please don't be confused by my commit history, I just fixed a mistake and then reverted so it wouldn't show up as hundreds of changed lines in the comparison.

You can watch a video of the gold flower working in my own engine here, I ported the effects and rewrote it to work with yours:

https://youtu.be/4PEIZJIwKlI?t=44