Ignore pivot channels in animations.
add Windows Phone 8.1 to Module definition
Add Windows Phone 8.1 targets to frameworks
Add Protobuild version for Windows Phone 8.1
Add sharpdx dependencies
Add Windows namespace
Windows Phone 8.1 Support, Windows8 convergence minus ApplicationViewState event
Update Nant script
Update nsi installer definition
Fix for obscure bug on WP8

There is a bug on WP8 (Lumia 620, Lumia Black) with the Obscure event.
The bug occure sometimes when resume from the Lock screen and cause the
app to pause on a black screen.
It never happens when the phone is attacked to the debugger so this
required some sort of on-screen logging to figure out.

case #1
ApplicationIdleDetectionMode=Enabled (default)
App is suspended either by timeout or power button.

Obscured event triggered. IsLocked=true.
It's safe to ignore the Obscure event since the OS deactivates the app
anyway. IsActive is set to false by OnDeactivate.
When the user unlock the phone Unobscure event triggered but *sometimes*
another Obscured event
arrive after that, causing to app to remain in IsActive=false state.
That's why we need to ignore the event.

case #2
ApplicationIdleDetectionMode=Disabled
App is suspended either by timeout or power button.

Obscured event triggered. IsLocked=true.
We set IsActive=false on Obscure event as before.
When the user unlock the phone Unobscure event triggered and we set
IsActive=true.
Actually a second obscured event is triggered following by an
Unobscured, not an issue here.
In that mode the OS doesn't deactivate the app, allowing the app to run
under lock screen.
note: actually MonoGame doesn't allow run under lock screen
https://github.com/mono/MonoGame/pull/2084.

case #3
ApplicationIdleDetectionMode=Enabled|Disabled
App is suspended by a phone call.

Obscured event triggered. IsLocked=false.
We set IsActive=false on Obscure event.
When the action that obscured the app ends, an Unobscure event is
triggered and we set IsActive=true. No bug here.
That is similar to case #2. The OS doesn't deactivate the app.
Windows Phone 8.1 Template
Remove unneded dependency
explicitly build Any CPU platform for nant build on wp81
Add Protobuild that only does AnyCPU for WindowsPhone81
Moved natural display orientation calculation to AndroidCompatibility
Added function to AndroidCompatibility to get the absolute display orientation
Set the game window's orientation to the current orientation on Android if the current orientation is supported by the game
One more quirk in Android to get the actual orientation (looks like the Kindles are behaving correctly after all)
Readded Lazy to NaturalOrientation to avoid the problem described in #2658
Update Protobuild with win8 metadata fix and only Any CPU support for wp81
Specify toolsversion during build for wp8.1
Update Protobuild that sets ToolsVersion sets Minimum Visual studio version, and imports Microsoft.Common.props