Usage Preference Dialog with PreferenceSetting

Improved on crash dialog to allow UsagePreference to make use of this dialog to display specific error as shown below.
![image](https://f.cloud.github.com/assets/5276243/1539916/6d08931e-4d15-11e3-81d8-9bd0820ffdac.png)

User can click on "Open Folder" to direct access the folder.

This error can be recreated by change option of the setting file to read-only, causing save operation to fail.
File is located at: C:\Users\USERNAME\AppData\Roaming\Autodesk\Dynamo\DynamoSettings.xml
Alternatively can RUN ( Window + R ) %APPDATA%\Autodesk\Dynamo