[Feature request] Add Material Conversion option to support some transparent material

[UzkiS]

I can convert some transparent materials such as blush from VQT processed ToonLit to VRChat/Mobile/Articles/Multiply to make transparent materials display normally. I hope the tool can directly handle this situation

[timerring]

Still works.

[timerring]

我 PR 了一版精简版 #48，可以直接使用。