Render relevant properties to buildcharacter.properties
Allow publishing only core (pr validation)
Allow retrieving STARR from non-standard repo for PR validation
IDE needs swing/actors/continuations
Merge pull request #3109 from adriaanm/faster-build-2.10

Faster build 2.10
[backport] Add buildcharacter.properties to .gitignore.

(cherry picked from commit 693e55e1cb75055bb243ffca2e18b8e44e80bb8c)
Merge pull request #3116 from retronym/topic/backport-character-ignore

Add buildcharacter.properties to .gitignore.