(doc) update proprietary license for shimgen.exe
(GH-505) Fix elevation required causes bug

 - This updates shimgen to the latest version which includes fixes for
   processes that require elevation and shimgen not properly calling those
   processes.
(doc) update changelog/nuspec
v0.9.8.25
(GH-505) handle user canceled elevation

 - If the user cancels elevation, do not error all over the place, just
   silently handle it
(GH-505) if using elevation, don't minimize the window

 - This update of shimgen doesn't minimize the window when elevation is used.