Nothing spectacular: added missing snippets and few completers.

This time just a few minor additions:
- changed Get-Command -Noun <tab> to support -Module (if provided)
- added *-VMNetworkAdapter -VMName Foo -Name <tab>
- added Set-StrictMode -Version <tab>
- added Get-WinEvent -LogName <tab>
- snippets for native commands and initializer/ completer pair