Layers with ruptures of different geometry types should have consistent styles

[ptormene]

If layers are styled by TRT, we might likely have a different number of TRTs per layer and the same TRT could be styled with a different color. We need the same TRTs to have consistent colors.
If layers are styled by magnitude, the ranges of magnitudes per layer would likely be different, therefore colors would not be consistent. We might consider using an absolute scale for magnitudes, so for instance a rapture with magnitude 7 will always have the same color across different layers.