Feature Request: Import texture mask

[delebash]

When using a landscape tool such as Gae or World Creator you can export a texture mask. This mask then connects to the automaterial and textures the landscape based on the mask. See this video for an example of creating and using a texture mask in an unreal material. https://youtu.be/V54kqpy1Q-Q?t=8180 just watch for a minute and it will show you how the texture mask is used in a material. TY