How to allow pixel art textures in CopperCube...
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If new to CopperCube, you will need to do the folloing to see the
IrrEdit/Irrlicht options...

    Tools --> Options
    Enable "Show IrrEdit/Irrlicht"
    Close and restart

Next, you will need to do the following to disable bilinear filtering...

   View --> Show irrEdit/irrlicht Properties
   
This should open a panel on the right-side of the CopperCube window. 
Under each material for every 3D object, you can make all sorts of 
adjustments, including turning off binlinear filtering. If a 3D object
has 20 materials, you will unfortunately have to got through each one
and disable the binlinear filtering.

And, if for some reason antioscoping is enabled, disable that too.