Add support for building LineageOS-16.0 (#30)

* Added initial Android 9 / LineageOS 16.0 support

* Add muppets16 containing Lineage-16.0 themuppets repos. Updated src/build.sh to allow building Lineage-16.0

* [Fix] Fixed switch for which themuppets repo to use

* [Fix] TheMuppets now supplies 16.0 manifests. Deleting local copy

* [fix] Fixed signing builds in Lineage-16.0 and added kmod to the docker image. (thanks @corna for both)

* Fix Android < 9 builds