Convert point from int64 to int

[artasparks]

Currently point uses int64. This is overkill and also makes iteration more annoying: https://stackoverflow.com/questions/34811167/can-i-make-the-index-int64-in-golangs-for-range-iteration

Int64 is massively overkill for golang points, so there's no reason we need to continue using int64. Oversight on my part when I originally created the struct.