GO: Update artifact logic for GOOD v3

[nguyentvan7]

• Automatically determine base and total rolls fields, if they are not filled in on the artifact. Expose this as an API so the artifact editor can use this easily as well
• If there is only one base-roll amount that works for the given artifact, automatically assign that to the IArtifact. Otherwise maybe dont fill it in, since we aren't sure?
• If the base and total rolls fields are already filled in, use this to determine the exact roll distribution (eliminates ambiguity between 8 and 9 roll artifacts in certain cases)
• If base rolls = 3 and level = 0, dont use the 4th substat (if it is there) in calculation
• Probably other things too