This may create memory leaks in the future, depending on the usage...

centroid was originally used by CanvasRenderer, now that it computes it as needed we don't need the bloat anymore.

Defaulting the crossOrigin attribute to 'anonymous' causes browsers to
not send credentials along with the request, even if the request is not
cross origin (at least with Chrome). A better default is to not set the
cross origin attribute, allowing browsers to behave normally. Users in a
cross origin environment can override this value.

previous was :
var fullPath = texturePath + "/" + sourceFile;
but texturePath may already have a slash (see extractUrlBase function)

changed slash to texturePath.slice(-1) === '/' : '' : '/'