v2.2.0

[orxfun]

Changes

• Eq is implemented for NodeIdx.
• Lifetimes of self references of NodeRef and NodeMut methods are revised.
  • Tests are added to make sure that expected code blocks compile: https://github.com/orxfun/orx-tree/blob/fix-188/revisit-lifetimes/tests/iterator_lifetimes.rs.
  • The fixes mostly break the dependency of the node reference and an iterator created from the node reference. Instead, the returned values lifetime is bound to the lifetime of the tree. Similar fixes are made for lifetime dependencies to the traversers.
  • Fixes Change NodeRef::walk_with to not require traverser to live as long as the tree / node #188
• replace and replace_with methods are implemented for NodeMut. These methods allow replacing part of the tree with another subtree.
  • Fixes Add convenience function NodeMut::replace #189