Fix Async, Cleanup all warnings, nuget package definitions iconurl etc.

[tomlm]

Zero warnings

[coveralls]

Pull Request Test Coverage Report for Build 82721

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 127 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-1.4%) to 76.801%

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Files with Coverage Reduction	New Missed Lines	%
/libraries/Microsoft.Bot.Builder.Dialogs/DialogManager.cs	21	70.0%
/libraries/Microsoft.Bot.Builder/BotFrameworkAdapter.cs	106	40.53%

Totals
Change from base Build 82619:	-1.4%
Covered Lines:	7131
Relevant Lines:	9285

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💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll compared against version 4.5.3
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll compared against version 4.5.3