add <DebugType>full</DebugType> property to debug build for uwp debugging (#2419)

Xamarin.Forms.Controls/Xamarin.Forms.Controls.csproj

@@ -12,6 +12,7 @@
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoWarn>0114;0108;0109;4014;0649;0169;0472;0414;0168;0219;0429</NoWarn>
+    <DebugType>full</DebugType>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DefineConstants>TRACE;APP</DefineConstants>