www/node10: copy from www/node, update 10.12.0_1 -> 10.13.0 (LTS)
Create a new port for the latest Node.js 10.13.0 LTS release. Update
CONFLICTS for the existing Node.js ports to include the new node10 port
and remove non-existent ports.
https://nodejs.org/en/blog/release/v10.13.0/
Sponsored by: Miles AS