ipl-stdlib v0.16.0

All included changes can be found on the milestone.

Changes

• Add Seq::map() to apply a callback to any iterable and Filter\Chain::yieldRules() to flatten a chain into a sequence of rules #75
• Add Seq::unique() to yield only the values of a sequence that are unique by strict, type sensitive comparison #76, #80
• Add Str::isEmpty() to check whether a string is null or empty after trimming whitespace #77

Fixes

• Seq::find() now returns null instead of false when no match is found in an array #79