Remove macros and all dependencies

[jdegoes]

The project should depend on only ZIO, with no other compiler plug-ins, macros, or third-party library dependencies.

[ahjohannessen]

Does this not also mean that this should not depend on scalaz and only zio?

[ysusuk]

@ahjohannessen you are actually right! the only thing missing here will be IList in ScatteringByteChannel.scala, GatheringByteChannel.scala, AsynchronousChannel.scala then we can safely remove scalaz from our dependencies.

[jczuchnowski]

@jdegoes @ysusuk the new repo depends only on ZIO, except for tests that use testz from scalaz and scalacheck. So I suppose we can close this issue.