Refactor issue batch running so that there is now a helper method in RefactoringService.
[Refactoring] Don't use the same IssueGroup instances in multiple parent groups.
[Refactoring] Show batch fixes in context menu. Fixes Xamarin #14521.
[Refactoring] Dispose the ProgressMonitor when done.
[Refactoring] Better progress reporting during batch running.
[Refactoring] Don't analyze projects that are disabled in the current configuration. Fixes Xamarin #14731
[Refactoring] Clear the code issue pad when closing the workspace.

Fixes second part of Xamarin #14730.
[Refactoring] Handle jobs finishing better.
[Refactoring] Use icons instead of text in the CodeIssuePad toolbar.
[Refactoring] Improve performance of the batch runner.
[Refactoring] Fix in-editor batch fixing.
Merge pull request #409 from mono-soc-2013/simonl/analysis-improvements

More analysis improvements