Making HelpOut more Eventful

[StartAutomating]

As HelpOut runs, several events should be generated.

These events can be used for tracing (see #171, #173)

• [ ] Event Get-MarkdownHelp.Input should track input to Get-MarkdownHelp
• [ ] Event Get-MarkdownHelp.Output should track output from Get-MarkdownHelp
• [ ] Event Save-MarkdownHelp.Input should track input to Save-MarkdownHelp
• [ ] Event Save-MarkdownHelp.Output should track output from Save-MarkdownHelp

They can also be used for triggered extensibility.