Support .NET Core

[jpsingleton]

This is just to track support for .NET Core as it's been talked about here and here but I couldn't find an open issue tracking it.

If there are any updates then please send a PR to https://github.com/jpsingleton/ANCLAFS and I'll update https://anclafs.com.

Cheers

[h0wXD]

In one of the articles is mentioned porting 0.19 to core would be a mammoth task, this is no longer true.
I got Simple.Data master running on .net core 2.1 for SqlServer within a very short time (1 hour~). Someone may look at fully porting it properly as I just wanted to know if it would work out of the box and it does.

For people interested in what changes were needed, have a look here: h0wXD@fffc3c9

Thanks for this awesome library!

[jdscolam]

This is nearly the last thing that is keeping us from adopting .NET Core.

[j-hudecek]

I've made some more conversions and managed to get most of the tests to pass - I had to remove SQL CE (no one uses it anyway) though:

j-hudecek@671262a

[santoshbhor]

Guys I was able to get everything working with .Net core (2.1,2.2,3.0 preview 9)
Please check my repo: https://github.com/santoshbhor/Simple.Data.Core...
Currently Following adapters were ported and tested as well SQLServer,Oracle,Npgsql, RawSql