sprites

When adjusting alpha on a pixel from the color picker it's quite easy to "whiff" the alpha bar and replace your current color with black because the SV box's area for some reason extends several pixels below the alpha bar's. Demonstration in the below image:

I'd recommend the alpha

Sometimes when changing image/document size you want to make it twice as big, or twice as small, or something similar. It would be useful to have an option to do this easily. One way to implement this would be making a dropdown with different units (pixels, percents/fraction, other can be added as well later)

现在的投影导出方式只有 litematic，这就意味着对于 forge 端来说，直接放弃了 1.12.2 之后的版本。希望能添加对原版结构方块的支持。

另外也希望能增加一些新方块（比如 MapartCraft 支持的更便宜的地毯、半砖等）和提供禁用[末影人能搬动的方块](https://minecraft.fandom.com/zh/wiki/%E6%9C%AB%E5%BD%B1%E4%BA%BA#.E7.A7.BB.E5.8A.A8.E6.96.B9.E5.9D.97