After an extension is updated/removed, reload Brackets instead of quitting
Small cleanups.  Move reload functions to DocumentCommandHandlers.
Small cleanups.  Update string constant names.
Roll back incorrect changes on translation strings
Small code clean up
Update ExtensionManager unit tests and small clean up
Merge pull request #6487 from lkcampbell/fix-6350

After extension is updated/removed, reload Brackets instead of quitting