Use event methods for theme subscriptions
Use event methods in EditorComponent
Add KeymapManager::onDidLoadBundledKeymaps
Use the new split*() methods on Pane model in WorkspaceView specs
Add ThemeManager::onDidUpdateStylesheet
Move global editor stylesheet updating into the ThemeManager
Subscribe to items via event methods. 

Add deprecation warnings when they don’t return a disposable
nof
Fix / clean up specs
Move the deprecations
Merge pull request #3514 from atom/bo-remove-method-deprecations

Remove event deprecations from core