Unrestrict unordered-containers and move it to my packages
Unrestrict unordered-containers and move it to my packages

Closes #5449.

iand675/stackage,simonmichael/stackage,jonschoning/stackage,michalkonecny/stackage,fpco/stackage,Daniel-Diaz/stackage,mrkkrp/stackage,massysett/stackage,soenkehahn/stackage,clinty/stackage