Rumble 1.16.1 "Shagbark Hickory" beta

Interim release.

• Fixed race condition issue with min() and max() called multiple times that led to possibly incorrect output.
• The sum() and count() functions are now able to stream locally on very large (non parallelized) sequences.
• Range expressions now support 64 bit integers as well (before this, an overflow happened)
• The arrow syntax works for dynamic function calls, too, so in Rumble ML pipelines can also be called with a pipelining syntax: $training-set=>$my-transformer($params)=>my-estimator($params)
• substring() was fixed to follow standard behavior even with exotic parameters (mostly returning an empty string in these cases)