add vivid-ubuntu-core.txt
rename vivid:stable-phone-overlay.txt as vivid-stable-phone-overlay.txt

scripts/active_edit, scripts/check-syntax, scripts/cve_lib.py,
scripts/cve_packages, scripts/mass-cve-edit, scripts/source_map.py,
scripts/support_tool.py, scripts/ubuntu-table:
- update to support ppa overlays

adjust 00boilerplate* to add vivid/stable-phone-overlay and vivid/ubuntu-core
adjust active/CVE-* to include vivid/stable-phone-overlay and vivid/ubuntu-core

TODO: verify retired vivid CVEs are fixed in the overlay