About .NET Core support

[LonghronShen]

I have made an almost done migration for Lucene.Net.Analysis.PanGu on both .NET Standard 1.6 and .NET Framework 4.5.1 platforms. See my Lucene.Net.Analysis.PanGu netcore branch

See if we can merge the new branch back to yours. @JimLiu

[JimLiu]

Great job!

Send a Pull request please, I'll merge that.

[LonghronShen]

Still have some problems, the unit tests not all cleared.
Lucene.Net 4.8 has changed a lot comparing to 3.03, so we need more tests.
I'll send a PR to you, but you don't need to merge it now. After all tests passed, let's merge.

[LonghronShen]

Wait, my netcore branch is whole new from your master branch, so PR failed.
Let's make a new netcore branch in your repository? @JimLiu

[JimLiu]

@LonghronShen
I've added you as a Collaborator, so you can do what you want.

[LonghronShen]

OK, I'll create a new netcore branch, and make a PR.
Currently what we need is writing more unit tests and see if the new Lucene.Net 4.8 is stable enough.
And about the missing functionality in PanGu lib on .NET Standard 1.6 platform, mainly inlcuding:

• Microsoft.VisualBasic.Strings.StrConv missing
  I think we need to use OpenCC (https://github.com/BYVoid/OpenCC) instead, but we need to package that native lib into a NuGet package like libuv(https://www.nuget.org/packages/Libuv/1.9.1).
• Missing AppDomain so maybe dynamic type loading is not supported
  I think it's not a big problem.

[LonghronShen]

A .NET Core 2.0 port has been done and used internally for months, so I pushed my new netcore2.0 branch.
Another, let's see if we can contribute the repository to the .NET China Community to involve more people in? @JimLiu