Add FileActivation Handler

Description:
This changes adds the ability to activate a WinObjC app via a file (typically registered for in the appx manifest. See https://msdn.microsoft.com/en-us/windows/uwp/launch-resume/handle-file-activation for more details on this process). This change wires up the activation to the UIApplicationDelegate. This approach was taken as opposed to the more conventional process described at https://developer.apple.com/library/content/documentation/FileManagement/Conceptual/DocumentInteraction_TopicsForIOS/Articles/OpeningSupportedFileTypes.html#//apple_ref/doc/uid/TP40010412-SW1 because file activation can happen for multiple files, for a particular verb (open, upload, edit, etc) and can happen while the app is already in the foreground. These differences make the experience different enough that co-opting the other handler seemed inappropriate and would lose fidelity. 

How verified:
new tests

Reviewed by: 
aballway, mnithish

* Update all VS projects to target the RS1 SDK.
* Bring up TargetPlatformMinVersion to 10.0.10586.0 for a few missed projects.

…dateWithTelemetry. (#1104)

…ivation (#1142)

* Our activation code is starting runloop synchornously in the main thread.
This turned out to be bad for some apps.  This change is to do an aysnc
task that sets up the runloop.

* Added comments on why runloop has to be done asynchronously

* Code review feedback

* Code review feedback

* Code review comments

#1137)

Bridge NS and CFStream as well as make CF components use Ebr functions for interoperabilty. 

Description:

Bridge NS and CFStream as well as make CF components use Ebr functions for interoperabilty. This is a prestep to unify the file handling mechanics through stream and data instead of direct reliance on Ebr functions. 

Works towards #1099
extend fopen to look for things in Windows.Storage.AccessCache is what this works towards. The basic steps are:
1. Bridge use of CF/NSStream
2. Consolidate Ebr usage across repo to use Stream
3. Enhance underlying support for storage file.

How verified: New UTs and old UTs

Reviewed-by: rajseh-msft, ms-jihua

…for build telemetry. (#1117)

This reverts commit e850555.

…es that depend on the file support telemetry. (#1160)

* Updating cert with expiration date for another year.

* Updating keys for all the other apps as they are set to expire.