fix warnings, and bogosity in projectfiles

OpenRA.Game/Server/Server.cs

@@ -165,7 +165,7 @@ namespace OpenRA.Server
 				foreach (var t in ServerTraits.WithInterface<IClientJoined>())
 					t.ClientJoined(this, newConn);
 			}
-			catch (Exception e) { DropClient(newConn); }
+			catch (Exception) { DropClient(newConn); }
 		}
 
 		public void UpdateInFlightFrames(Connection conn)
@@ -193,7 +193,7 @@ namespace OpenRA.Server
 				ms.Write( data );
 				c.socket.Send( ms.ToArray() );
 			}
-			catch (Exception e) { DropClient(c); }
+			catch (Exception) { DropClient(c); }
 		}
 
 		public void DispatchOrders(Connection conn, int frame, byte[] data)

OpenRA.Renderer.Null/OpenRA.Renderer.Null.csproj

@@ -60,7 +60,6 @@
       <Name>OpenRA.Game</Name>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
@@ -69,4 +68,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>

OpenRA.Utility/OpenRA.Utility.csproj

@@ -61,7 +61,6 @@
       <Name>OpenRA.FileFormats</Name>
     </ProjectReference>
   </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
@@ -70,4 +69,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>

RALint/RALint.cs

@@ -27,7 +27,7 @@ namespace RALint
 			++errors;
 		}
 
-		static Dictionary<string, int> ValidPrereqs;
+        static Dictionary<string, int> ValidPrereqs = new Dictionary<string, int>();
 
 		static int Main(string[] args)
 		{