Add Windows post module for reading/searching Outlook e-mail

This module allows to read and search e-mails present in Outlook installations. It is using powershell in order to search the e-mails.

When connecting to Outlook using powershell, a security popup appears. WinAPI is used to automatically click on the popup, so access is allowed.

This module is tested on Windows 8.1 x64 with Outlook 2013.
While looking more and more at this module i think this should be an action. When using actions, you should also clarify the datastore options and when they are used (example: the FOLDER option is ignored when only listing folders).

So we have two actions:
- List Folders
- Search Email

So you could define
```
'Actions' => [
    [ 'LIST', { 'Description' => 'Lists all folders' } ],
    [ 'SEARCH', { 'Description' => 'Searches for an email' } ]
],
'DefaultAction' => 'LIST'
```

or split this module in 2 seperate ones, it's up to you :)