Crate easy_conv

Cut down on trivial impl From<A> for B boilerplate code.

Macros

• chained_into
  Implement conversion from A to Z via B, C, …
• newtype_wrap
  Implement conversion from T to its newtype wrapper.
• newtype_wrap_from_any
  The same as newtype_wrap, except that the wrapping is implemented on all types U that convert to T via into().