Runtime/Behavior Changes

Modifying LineType's in the LineType cache now causes an assertion failure

We had a few bug reports caused by extensions modifying the colors of LineType's after they had been placed in a cache.

To prevent this from happening again we added an assert in private LineType getCachedLineType(str key) running in developMode that will produce an assertion failure (crash) if you do this in your extension and then attempt to retrieve the LineType from the cache.

You should never be modifying the members of an already cached LineType. If you run into this error, please copy the LineType before attempting to modify it, so that you don't update the cached instance.