feature: add the tizen30 platform to reactiveui

[ghuntley]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

feature

The Plan

• Get a clean msbuild without referencing any Tizen platform specifics. (we are here; current attempts blocked at this stage)
• Generate and package reactiveui-events for tizen30 via downloading packages from NuGet.
• Start adding platform specific/public API surface to reactiveui

Other information:

• The TFM is tizen30 as per Adding new TFM for Tizen.Net NuGet/Home#4175 which was implemented in over at https://github.com/NuGet/NuGet.Client/pull/1083/files
• NuGet v4.1 (now released) has support for this TFM.
• We are super-early adopters - expect 🐉's - based on some googling only other person who has tried this yet is @maltegoetz https://github.com/jamesmontemagno/SettingsPlugin/pull/72/files

Blocked until figure out how to multi-target the platform correctly:

Error message after 7e9535a

Error message after 2fb2ba4

AppVeyor does not have the tizen SDK's installed but I do on my local machine (obtained yesterday from https://developer.tizen.org/development/tizen-.net-preview/getting-started/installing-visual-studio-tools-tizen). All screenshots/logs are from my local machine.

/cc @WonyoungChoi

[clairernovotny]

I added preliminary support for Tizen in the extras package. You'll need the CI feed for now:
https://www.myget.org/F/msbuildsdkextras/api/v3/index.json

It's 1.0.5-beta.51. Based on the way the Xamarin TFM's and all are structured, you'll likely need to do conditional PackageReference for the tizen30 TFM for the tizen specific packages you want/need since no one seems to be using the tizen30 tfm in their packages yet.

[clairernovotny]

@ghuntley Tizen now will build correctly. What you need is to update the shared\Registrations.cs since there's nothing in there for Tizen.

There is a TIZEN and TIZEN3_0 symbol defined if you want to condition off of either of those.

[ghuntley]

Thanks for helping out here @onovotny.

[WonyoungChoi]

I am sorry to inform you late. Tizen .NET preview 4 has been released last week. Unfortunately, however, the Tizen TFM has not been used yet. I recommend making a seperated package for tizen and using netstandard for it until the Tizen TFM is ready. And please use Tizen.NET 3.0.0 instead of Tizen.Library. The Tizen.Library will not be managed anymore.

[clairernovotny]

Thanks @WonyoungChoi, good to know. If it helps, I've added support for the Tizen TFM's in my MSBuild.Sdk.Extras package so that SDK-style projects can build them.

[clairernovotny]

@WonyoungChoi The directions are here, https://github.com/onovotny/MSBuildSdkExtras/blob/master/README.md#using-the-package, and I'm happy to help any way I can.

[WonyoungChoi]

@onovotny Thank you for adding Tizen tfm to your package. :) It will help us a lot.

[clairernovotny]

@WonyoungChoi it probably won't help with the application projects, since that requires support from your project system for debugging, but it "teaches" the SDK-style project system how to build class libraries that can target your platform. Please feel free to reach out to me anytime if you need help. My email is oren at novotny dot org.

[ghuntley]

Linking dotnet/corert#4856 in with this thread.

[ghuntley]

Replaced by #1546