added youtube channel link

videos are way better than the simple screenshot
Fixed issue by mimiking a negative lookbehind
Fixes after review
import rewire to assist in testing
Only allow leading numbers and letters (largely to prevent names like "..")
Merging Glenn's Hover Preview extension into core.
Move out hover preview menu item label to strings.js for localization.
Remove unused variables and clean up some variable declarations.
Initial extension manager dialog/view/model (with non-final layout)
Respond to review comments
Make JSHint happy.
Update comments to remove the Mustache note, since these can work with Handlebars too
Code review fixes.
Renamed ExtensionMgr to ExtensionManager
Tweaked dialog so it's centered a little better
Move HTML templates to htmlContent
Another round of code review changes.
Merge pull request #3441 from adobe/merge-hover-preview

Merge hover preview
Trigger a WorkingSet sort after enabling Automatic Sort
Updated by ALF automation.
remove spurious IntelliJ files