[birt-dev] Checkin: Add JS code assist in JSEditor.

["Yuejie Chen" <yuejie.chen@xxxxxxxxxxx>]

- Summary: Add JS code assist in JSEditor.

- Bugzilla Bug (s) Resolved:

- Description: Currently support static methods and fields, report dataset columns. Methods and fields activated by Ctrl+space or '.', columns activated by 'row['.

- Tests Description:

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:

- Notes to Documentation:

- Files Edited:
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/js/JSSourceViewerConfiguration.java
- Files Added:

/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/js/JSCompletionProcessor.java

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