Add other package renames

[avh4]

Ready to happen

• elm-community/elm-linear-algebra -> elm-community/linear-algebra
• elm-community/elm-lazy-list -> elm-community/lazy-list
• elm-community/elm-webgl -> elm-community/webgl (Adding Elm 0.18 elm-community/elm-webgl#42, Drop elm- from package name elm-community/elm-webgl#16)
• NoRedInk/elm-string-extra -> elm-community/string-extra
• lorenzo/elm-string-addons -> elm-community/string-extra

Need to wait until these are published for 0.18

• TBD

[avh4]

We're done with 0.18 🎉