Textures
The following format is used when adding textures:
[root]/[modId]/[cellId].png
[root] is the folder in which the icon.png and texturepack.json files are stored.
Default modIds and cellIds can be found here.
Cell Texture Constraints
- the image must have square dimensions
 - the size of the image should be a power of 2
 - the image has to be in 
.pngformat