Revert logging technique back to netstandard2 approach

.editorconfig

@@ -0,0 +1,6 @@
+# Matrix.Example.Client uses spaces
+# Matrix.Tests omitted as I don't know how to specify multiple targets here
+[Matrix/*.cs]
+curly_bracket_next_line = true
+indent_style = tab
+indent_size = 4

Matrix.Tests/Backend/TestingAPIBackend.cs

@@ -11,6 +11,10 @@ public MatrixRequestError Get  (string apiPath, bool authenticate, out JToken re
             return null;
         }
 
+		public Task<MatrixAPIResult> GetAsync(string apiPath, bool authenticate) {
+  			return null;
+		}
+
 		public MatrixRequestError Post (string apiPath, bool authenticate, JToken request, out JToken result) {
             result = null;
             return null;

Matrix/Client/Keys.cs

@@ -10,4 +10,4 @@ public Keys(MatrixAPI api)
 
         }
     }
-}
+}

Matrix/Client/MatrixClient.cs

@@ -75,6 +75,7 @@ public MatrixClient (string URL, string application_token, string userid)
         /// Initializes a new instance of the <see cref="Matrix.Client.MatrixClient"/> class for testing.
         /// </summary>
         public MatrixClient (MatrixAPI api){
+            log.LogDebug("ctor: baseurl={}", api.BaseURL);
             this.Api = api;
             api.SyncJoinEvent += MatrixClient_OnEvent;
             api.SyncInviteEvent += MatrixClient_OnInvite;

Matrix/Logger.cs

@@ -1,12 +1,32 @@
 using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Console;
+using Microsoft.Extensions.Options;
 
 namespace Matrix
 {
     public static class Logger
     {
-        public static ILoggerFactory Factory = LoggerFactory.Create(builder =>
-        {
-
-        });
+        static ILoggerFactory factory;
+
+        /// <summary>
+        /// Needs to be externally set, one typical use case would be it's set during Startup configuration
+        /// </summary>
+		public static ILoggerFactory Factory {
+			get 
+			{
+				// Stuffing in a console logger in a 2.1+ compatible way looks
+				// like a lot of work if you aren't using IServiceCollection
+#if NETSTANDARD2_0
+				if (factory == null)
+					// Call may not be present in .NET Standard 2.1
+					factory = new LoggerFactory().AddConsole(LogLevel.Debug);
+#endif
+				// NOTE: Might not be performant always creating empty factories,
+				// but want to give code opportunity to eventually log somehow
+				// (i.e. you really are expected to assign Factory)
+				return factory ?? new LoggerFactory(); 
+			}
+            set { factory = value; }
+        }
     }
 }

Matrix/Matrix.csproj

@@ -14,16 +14,12 @@
     <PackageReleaseNotes>Initial package release.</PackageReleaseNotes>
     <Copyright>Copyright 2017</Copyright>
     <PackageTags>Matrix SDK</PackageTags>
-    <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
     <LangVersion>7.2</LangVersion>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Logging" Version="3.0.0-preview.19074.2" />
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.2.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.2.0" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.1" />
     <PackageReference Include="YamlDotNet" Version="5.3.0" />
   </ItemGroup>
-  <ItemGroup>
-    <Compile Include="**\*.cs" Exclude="bin\**;obj\**;" />
-  </ItemGroup>
 </Project>