Clean up marker
Clean up atom details section
Make focusing other pane views from workspaceView private
WorkspaceView is extended
Move observePaneItems and onDidChangePaneItem to essential
Opener stuff is essential
saveAll is private
PaneView is private
Upgrade text-buffer for better docs
Reorg Editor a bit based on conversations

Move heavier used sections near the top of the file. Make some of the
single extended methods public.
Reorg decoration
Rename cursor sections
Data -> Details
Merge pull request #3583 from atom/bo-final-docs-pass

Final docs pass