Fix netstandard2 + .NET 4.6.2

[Alexx999]

netstandard2 support layer for .NET 4.6.1-4.7.1 abuses redirects - it has both chained redirects (System.Object is redirected from System.Runtime.dll to netstandard.dll to mscorlib.dll) and duplicated redirects (System.Data.* types are redirected to System.Data.dll by both System.Data.Common.dll and netstandard.dll).
First case ends up with Assembly.GetTypes() throwing due to missing types and second case ends up with startup crash due to duplicated types.

[Alexx999]

I wonder if it's OK to switch AppVeyor to VS2017 image?

[Alexx999]

Switching requires unit test fixes from the other PR anyways so that depends if you're going to accept it (in which case that goes first) or not (then I'll cherry-pick that into here).
Builds fine on my master with "Previous VS2017" setting

[gluck]

This one LGTM, I would support merging it before the other, which is too big to be reviewed quickly.
Is the cherry-pick big or is it just this one ?

Thx !

[Alexx999]

I've cherry-picked relevant pieces from my master - tests should be OK now.
Failure with VS2017 v15.8 looks like com.ullink.msbuild issue - namely, ProjectFileParser crashes due to some dependency conflict, however, I didn't have time yet to dig deeper.

The other PR consists mostly of abandoned 0.10 branch - I have no idea why it was abandoned in the first place (lack of time I guess?) because it's extremely close to actually working on 0.10 cecil (sans Win32 resource handling).

[gluck]

Thanks ! will look at the cecil 0.10 branch when I get some time, would be great if you could rebase it.
Win32 was the main issue preventing the unfork, good idea separating it out.

[Alexx999]

OK, I've rebased the other pull request.

[0x53A]

Hi, I think I'm hitting these issues when trying to merge asp.net core assemblies.

Would it be possible to push a new release to nuget?

Thank you for this awesome project, really helpfull!

[Alexx999]

@0x53A I'm using package id avostres.ilrepack as a stopgap solution - it includes this PR and the bigger 0.10 cecil PR

[timotei]

@Alexx999 @gluck We should probably update the CHANGELOG.md also, so it's clear what changed in this version.

[timotei]

Hmm, for .NET standard it should actually be

        <TargetFramework>netstandard2.0</TargetFramework>

No? Otherwise it's just .NET 4.6.2

Also, the structure of the project should be different.

[Alexx999]

As this PR says it's about "netstandard2 support layer for .NET 4.6.1-4.7.1"