Fix issues with this sample#3

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ChrisGuzak wants to merge 10 commits intoAppInstaller:masterfrom

ChrisGuzak:master

Commits on Sep 20, 2018

update to latest SDK 17134
Chris Guzak (WINDOWS)
committed
latest SDK
Chris Guzak (WINDOWS)
committed
tabs -> spaces, minor code cleanup
Chris Guzak (WINDOWS)
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use __stdcall for dll export
Chris Guzak (WINDOWS)
committed
tabs -> spaces
Chris Guzak (WINDOWS)
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Commits on Sep 21, 2018

use __stdcall, proper calling convention used by the client
Chris Guzak (WINDOWS)
committed
use the TryGetItemAsync to find files that may not be present, avoid exceptions
Chris Guzak (WINDOWS)
committed
user relative path to content file, report error on LoadPackagedLibrary failure
Chris Guzak (WINDOWS)
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use dynamic_cast to differentate file/folder/null, simpler code
Chris Guzak (WINDOWS)
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Commits on Sep 25, 2018

c++17, /await, cert thumbprint updates
Chris Guzak (WINDOWS)
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