Support multiple textures within one atlas

[EngineerSmith]

If a texture is filled, another one should be created in order to have all given textures added to an atlas. Currently it will throw a warning or error that isn't useful as different machines have different max texture sizes and working on one machine doesn't directly mean it will work the same on another

[EngineerSmith]

After further investigation, this isn't a top priority as it isn't realistically a problem. Comment here if it is, and I can look into this issue once more. I did start some work to move to using texture arrays, but trying to figure out how to pack in to that array is a more challenging problem than just trying to pack images into a 2d array.
Open for PR if you want to tackle it.