"Save The World" released!

Featuring new graphics, half-blocks, and more, it's here! You can now save and share worlds.

A (hopefully) complete changelog of everything you'll see:

• New graphics for everything that wasn't already custom graphics. Nothing is stock anymore. This is an upgrade in some places and a downgrade in others; I'm not very good at making graphics and don't have the money to pay someone who is.
• Gravity-symbols now occupy a layer behind blocks, allowing partially-solid blocks to have a gravity-field within them.
• Slopes no longer have the same properties as circles, since they can be combined with arrows and there is no need for such a workaround.
• Ten different colors of blocks, with 4 matching slope graphics and 4 matching half-block graphics.
• Holding space no longer makes you bounce. This may be re-added with a delay, but it got annoying when trying to jump into flipped gravity.
• The camera now snaps instantly to new gravities, rather than asymptotically approaching them.
• There's a new space background, which rotates to match gravity (instead of the stage appearing to rotate while the background stays in place)
• There's a main menu, from which you can load, and which taunts you with disabled "server" and "client" buttons. Muahahaha.
• There's a new menu, in which you can save.
• Pressing L will disable editing and the relevant UI, so you can play a level without the block palette in the way.
• Bugfixes I forgot about, probably.

I may have forgotten a few things.

Under-the-hood changes:

• The world is now divided into layers, in preparation for 0.0.3, though only one is used right now.
• Block IDs have been added, to simplify blocks that use multiple tiles for different rotations (such as slopes, which use different graphics to keep the lighting pointing the right way.) This makes working with these massively easier.
• Block metadata field added, in preparation for blocks that need metadata in 0.0.3
• The UI code has become incredibly gross and hacky, since it's about to be replaced. I am unrepentant.