.ignore v2.1.0-RC.1

Implemented enhancements:

• Migration to the native IDE indexing
• EAP repository channel

Fixed bugs:

• Performance improvements ##415
• ConcurrentModificationException in THashIterator ##413
• Read access is allowed from event dispatch thread or inside read-action only ##419
• UnsupportedOperationException in IgnoreEditorManagerListener ##399
• Missing StyleLint parserDefinition ##394