Set C# version to 7.0 instead of latest to fix build issues

Updated assembly info

src/Artemis.UI/Artemis.UI.csproj

@@ -27,6 +27,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>7</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
@@ -58,6 +59,9 @@
     <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
     <Prefer32Bit>true</Prefer32Bit>
   </PropertyGroup>
+  <PropertyGroup>
+    <ApplicationIcon>logo-512.ico</ApplicationIcon>
+  </PropertyGroup>
   <ItemGroup>
     <Reference Include="Castle.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc, processorArchitecture=MSIL">
       <HintPath>..\packages\Castle.Core.4.4.0\lib\net45\Castle.Core.dll</HintPath>
@@ -246,6 +250,9 @@
   <ItemGroup>
     <Resource Include="FodyWeavers.xml" />
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="logo-512.ico" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PostBuildEvent>