Added gitignored file to control inner loop solution (microsoft#1513)

Added gitignored area props file so that using the inner loop solution can be easier.

.gitignore

@@ -254,6 +254,7 @@ CodeCoverageOutput/
 
 # Private (not-checked-in) build properties
 local.props
+InnerLoopAreas.props
 
 # Files from OS repo to ignore
 .cachedFileHashes

FeatureAreas.props

@@ -49,6 +49,8 @@
     <FeatureTreeViewEnabled>false</FeatureTreeViewEnabled>
     <FeatureTwoPaneViewEnabled>false</FeatureTwoPaneViewEnabled>
   </PropertyGroup>
+  <!-- Import this after inner loop features are declared so that it overrides those properties -->
+  <Import Project="InnerLoopAreas.props" Condition="Exists('InnerLoopAreas.props') And $(SolutionName) == 'MUXControlsInnerLoop'"/>
   <!-- Features to include for official build (should be all features) -->
   <PropertyGroup Condition="$(SolutionName) != 'MUXControlsInnerLoop'">
     <FeatureAnimatedVisualPlayerEnabled>true</FeatureAnimatedVisualPlayerEnabled>

InnerLoopAreas.props

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT License. See LICENSE in the project root for license information. -->
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <!-- Feature to include for inner loop build -->
+  <PropertyGroup Condition="$(SolutionName) == 'MUXControlsInnerLoop'">
+    <FeatureTabViewEnabled>true</FeatureTabViewEnabled>
+  </PropertyGroup>
+</Project>