Ported .Net Core commits:

hondacrx:
- Initial commit: Switch to .Net Core 2.0
- Fix build and removed not needed files
Fabi:
- Updated solution platforms.
- Changed folder structure.
- Change library target framework to netstandard2.0.
- Updated solution platforms again...
- Removed windows specific kernel32 function usage (Ctrl-C handler).

Deps/Source/Google.Protobuf/Google.Protobuf.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <Description>C# runtime library for Protocol Buffers - Google's data interchange format.</Description>
+    <Copyright>Copyright 2015, Google Inc.</Copyright>
+    <AssemblyTitle>Google Protocol Buffers</AssemblyTitle>
+    <VersionPrefix>3.4.1</VersionPrefix>
+    <Authors>Google Inc.</Authors>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <PackageTags>Protocol;Buffers;Binary;Serialization;Format;Google;proto;proto3</PackageTags>
+    <PackageReleaseNotes>C# proto3 support</PackageReleaseNotes>
+    <PackageProjectUrl>https://github.com/google/protobuf</PackageProjectUrl>
+    <PackageLicenseUrl>https://github.com/google/protobuf/blob/master/LICENSE</PackageLicenseUrl>
+    <RepositoryType>git</RepositoryType>
+    <RepositoryUrl>https://github.com/google/protobuf.git</RepositoryUrl>
+    <IncludeSymbols>true</IncludeSymbols>
+    <IncludeSource>true</IncludeSource>
+    <Platforms>x64</Platforms>
+  </PropertyGroup>
+
+</Project>