.NET Shell Extensions - Shell Drop Handlers

Context Menu
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* Support check items.

* Support
  - File Class
  - File Extension (only)
  - File Class by Extension
  - All Files
  - Directory
  - Drive
  - Unknown

Property Sheet
==============

Icon Handler
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DONE: Create an example icon handler that shows whether an assembly is managed or not.
DONE: Set DefaultIcon to %1 when registering an icon handler server.
DONE: Store the old DefaultIcon in the registry class when changing to %1 so
  that it can be restored on unregistration. Currently there are permission issues.
* Seems like when the icon handler is used multiple times in the same parent folder, icons
  are not correct - may be a sharing issue.

Server Manager
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DONE: Support Icon Handler tests, calling the one key function and having a dummy shell.
* Support Property Sheet tests, calling the two key functions and having a dummy shell.
* Allow Enable/Disable event log.
* Allow Quick View of event log.
* Show testing context menu items in bold, only test associated items.

Unit Tests
==========

* It would be entirely possible to test the server registration manager with unit tests - 
however, they would really be integration tests as they'd have to be run on different 
operating systems with different processor architectures.