update KiCAD and it's libraries to 5.1.2

See http://kicad-pcb.org/blog/2019/04/KiCad-5.1.2-Release/ and
https://launchpad.net/kicad/+milestone/5.1.1 and
https://launchpad.net/kicad/+milestone/5.1.2

Taking over maintainership from thierry@, with thanks for getting these
ports this far.

PR: 237654
Approved by: thierry (maintainer)