Fix "Save to CSV" CodePages assembly version mismatch (#790)

* Fix "Save to CSV" CodePages assembly version mismatch

* Add comment to delete packagereference once moving off preview version

build.json

@@ -16,9 +16,9 @@
     "netcoreapp2.2"
   ],
   "MainProjects": [     
-    "Microsoft.SqlTools.ServiceLayer",
     "Microsoft.SqlTools.Credentials",
-    "Microsoft.SqlTools.ResourceProvider"
+    "Microsoft.SqlTools.ResourceProvider",
+    "Microsoft.SqlTools.ServiceLayer"
   ],
   "PackageProjects": [
     "Microsoft.SqlTools.CoreServices",

src/Microsoft.SqlTools.Credentials/Microsoft.SqlTools.Credentials.csproj

@@ -28,6 +28,9 @@
     <PackageReference Include="System.Composition" Version="1.1.0" />
     <PackageReference Include="Newtonsoft.Json" Version="10.0.2" />
     <PackageReference Include="System.Security.Permissions" Version="4.5.0" />
+
+    <!-- delete reference from project once moving off preview version !-->
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.6.0-preview3-26501-04" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="**\*.cs" />

src/Microsoft.SqlTools.ResourceProvider/Microsoft.SqlTools.ResourceProvider.csproj

@@ -19,6 +19,10 @@
     <DefineConstants>TRACE;DEBUG;NETCOREAPP1_0;NETCOREAPP2_0</DefineConstants>
   </PropertyGroup>
 
+  <ItemGroup>
+    <!-- delete reference from project once moving off preview version !-->
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="4.6.0-preview3-26501-04" />
+  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Microsoft.SqlTools.Hosting\Microsoft.SqlTools.Hosting.csproj" />
     <!-- Note: must reference the resource provider projects in order for them to be bundled into the app. Otherwise will not have any of the required DLLs and