- renders are now fully isometric
- used position -0.5 and size +1 at some places to fix#32
- does not support overlay yet
- does not support left/right arms/legs
- does not support slim renders yet
- currently only renders full body, not head
this is a temporary fix for #32.
it doesn't solve the problem, but it makes the renders much less worse.
in combination with #134 this will hopefully lead to fixing the problem entirely
- we don't need to resize images. canvas can do that for us
- we don't need to use `scale(-1, 1)` to draw flipped
- most of the old/new skin format shares the same code
- we can draw the skin image directly on the canvas
