8167456: Tweak IntelliJ langtools project's jtreg settings
Summary: Adjust IntelliJ project template to reflect new serialized format of jtreg plugin settings
Reviewed-by: jlahoda

8164481: Remove jtreg run configurations from langtools idea project
Summary: Update langtools intellij project and related ant build files.
Reviewed-by: jlahoda

8058542: Devise scheme for better diagnostic creation
Summary: Add support for generating (at build-time) an enum-like class containing all javac diagnostics, which allows for safe diagnostic creation.
Reviewed-by: jlahoda, jjg, vromero, erikj, jfranck

8067006: Tweak IntelliJ langtools project to show jtreg report directory
Summary: Jtreg test output directory should be allowed to flow into IntelliJ's output
Reviewed-by: jlahoda

8049234: Add support for running/debugging bootstrap tools in IntelliJ
Summary: Add support for bootstrap tools; overhaul ant logger
Reviewed-by: vromero

8046451: Add basic IntelliJ support for langtools
Summary: Add new ant target 'idea' to create IntelliJ langtools project
Reviewed-by: jjg