_Images plugged into "Principled BSDF" 's Alpha will combine with Images at BaseColor as the alpha channel (Since Ogre use 1 image for both color and alpha).

_More options for texture's BlendBlock, controlled by Blender's 3 Blend modes:
* Alpha clip = just Blend Type: REPLACE
* Alpha Blend = a BlendBlock with custom setting, very transparent
* Alpha Hashed =  a BlendBlock with custom setting but less transparent than Alpha Blend

_There was plan for supporting other texture nodes aside from image, but I couldn't find a way to get the node's color matrices

some changes in prepare_texture affected the JSON config for metalness and roughness's texture paths

Users now have another option to plug metalness and roughness textures into the corresponding channels, aside from using the same texture and separate RGB

…AQUE

_BLEND and HASHED generate the ssame settings now
_CLIP only enable "alpha_test"
_OPAQUE doesn't have alpha_test or transparency

diffuse value is a vector3

…alue

_If you plugged in an Alpha texture, but Principled BSDF's "Base Color" is not plugged in, a new diffuse image will be exported, with color channels from "Base color" values and Alpha channel from the alpha texture.

_The new image will only have as many details as your Alpha texture, so it should be used on stuff with detailed Alphas but simple color channels - like hair cards

_Quick fix: change the condition of combining diffuse texture and alpha texture (from different file names to different paths)

The remaining utils are:
_Blendblocks types support
_Standalone metallic and roughness texture support