[NuGet] Show packages in Add Packages dialog.

Search not working.
Wrong search control being used.
Package installation not currently being done in background.
List view text does not word wrap.
Package information resizes on selecting a different package.
Can only see first page of packages.
[NuGet] Added basic search as you type in Add Packages dialog.

Needs to be updated to use custom search control instead of
text entry control.