Add support for Trello service
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'
IDEA-109435 Gradle tool window is missing in Cardea build 130.962

1. Ensure that external system tool window is shown when the first external project is linked to existing ide project;
2. Ensure that local external system settings are properly populated on importing new external project;
3. Green code policy is applied;
IDEA-107485 for "Unnecessary call to '.toString()' inspection