Define a limited set of filters for SingleLinePipeline
Removes the following filters from its parent GfmPipeline:
- SyntaxHighlightFilter
- UploadLinkFilter
- TableOfContentsFilter
- LabelReferenceFilter
- TaskListFilter
Closes #1697 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Removes the following filters from its parent GfmPipeline:
Closes #1697 (closed)