[birt-dev]CheckIn: Fix Bugzilla Bug 192569 --- Enhance engine IReportIte

["Wei Zhao \(Shang\)" <wei.zhao@xxxxxxxxxxx>]

Title: [birt-dev]CheckIn: Fix Bugzilla Bug 192569 --- Enhance engine IReportItemGeneration extension schema

- Summary:
Use the new extension schema.

- Bugzilla Bug (s) Resolved:
Fix Bugzilla Bug 192569 --- Enhance engine IReportItemGeneration extension schema

- Description:
Use the new extension schema.

- Tests Description  :
Manual Test

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:  
 
- Notes to Documentation:  

- Files Edited:
"/org.eclipse.birt.report.engine/schema/reportitemGeneration.exsd"
"/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/extension/internal/ExtensionManager.java"

- Files Added:

- Files Deleted

-Wei ZHao(Shanghai)