Created AsyncContext with timer support.
Removed Task from ITimer.
IGameLoopAction interface.
Removed GameLoopEventArgs reference from ITimedOperation.
Linux sln.
ContextLoopEvent.
WIP: Removed GameLoopEventArgs from SyncContext.
Renamed SyncContext to TimerContext.
Merge branch 'master' of https://jvlppm.visualstudio.com/DefaultCollection/_git/Jv.Games.Xna

Conflicts:
	src/Jv.Games.Xna.Async/AsyncContext.cs
Converted TimerContext to AsyncContext.
Activating the context during update.
Created AsyncGameComponent.
Moved Task to IAsyncOperation.
Created AsyncGameComponent.
Removed unused generic parameter.
Activity class.
Activity.Run.
Simplified csproj references.
Empty sample project.
Created sample activity.