Enable RazorCompileOnBuild=true by default

[rynowak]

Due to how our factoring is being done in 2.1-preview1 - the necessary properties to activate Razor compilation (using RazorSDK) during publish are part of the Web SDK. This means that a class library project won't do precompilation during publishing by default.

The workaround is to define a property that the WebSDK sets.

  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <ResolvedRazorCompileToolset>RazorSDK</ResolvedRazorCompileToolset>
  </PropertyGroup>

We plan to take ownership of these definitions from the WebSDK in 2.1-preview2 so this should just get solved at that point.

[rynowak]

@DamianEdwards - do you have concerns about this for preview1?

[DamianEdwards]

No this is fine, we'll be sure to document the requirements for preview1

[rynowak]

Stashing this in preview2 then - this tracks removing a workaround.

[rynowak]

@pranavkm assigning you. We plan to leave the current behaviour for preview1, but this can be fixed now in preview2 since we control the evaluation order.