WIP 0.6.4 - Polish the included install/uninstall experience

Changes

 - introduced Title (fallback to Id) property on WelcomeViewModel
 - introduced Summary property and updated view

TODO:

 - [ ] the uninstall view doesn't show AT ALL. IT'S MAGIC.
 - [ ] enhance the InstallingViewModel (same header as WelcomeViewModel?)
 - [ ] repro and resolve bug where you have multiple .nupkg in build output (it chooses the wrong file and Bad Things Happen)
- [ ] get logging to a point where you can see more about the flow of the installer