Bug修复，Wallpaper Engine项目下project.json指定的颜色值不能直接传入RGB，需要除255并向下取整，否则不会接受你的value作为默认值。

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Bug fix. in file project.json, can't use RGB color directly, must divide 255 then ceil it.

1.新增 “Background Color” 选项，现在可以自定义背景色了。
2.稍稍增大了粒子的半径范围。

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1.add "Background Color" option for wallpaper, now you can change background color whatever you want.
2.expand particle's radius a little bit.

新增"Particle Count"输入框，现在可以自定义粒子的数量了（0~1000）。
如果更改数量后壁纸出现卡顿现象，请重新加载壁纸（切换到其他壁纸再切换回来），后续会改进这个问题....

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Add a "Particle Count" input in 'properties' section, now you can change particle's count whatever you want (during 0~1000).
If wallpaper lays when you change particle count, please reload it(switch out then switch in), I will keeping improving this problem....

bug fix.

bug fix.

bug fix.