Smoother player movement (Faster jumping, slight height boost)

Changed a few numbers and added some magic numbers to make the player movement feel a lot more integrated and smoother. (I know how it works, I think)

Jumping is faster, and puts the player a tiny bit above the node, allowing them to fall down a bit. Makes the jumping sensation seem more effective and makes is easier to climb out of caves.

Player falling is a bit faster, helps the world feel more solid.

Removes the strange slight "sinking" that happens sometimes when you hop on top of a node while pushing against it.

A helpful side effect of these changes is that placing blocks under you while jumping is less glitchy, feels better, and lowers the chance of placing two at a time (though it still happens unfortunately.)

I will squash these commits after fine-tuning everything and fixing any glitches anyone finds.