* In Blazor cshtml files, auto-import Microsoft.AspNetCore.Blazor and Microsoft.AspNetCore.Blazor.Components. Fixes#749
* Remove redundant @using directives from tests
* Update assertion in test
* Update all affected baselines
* Before refactoring ParameterCollection assignment logic, add more test coverage
* Begin caching parameter assignment info
* Factor out some reflection code to a reusable location
* Use IPropertySetter to avoid all per-property-assignment reflection
* More error cases and tests for parameter assignment
* Enable binding to nonpublic properties
* Add analyzer to warn and provide fix for public component parameters
* Unit test for analyzer
* Component tag helper now includes private properties if they have [Parameter]
* CR feedback: Remove garbage from csproj
* CR feedback: Rename .Build.Analyzers to .Analyzers
* CR feedback: Move BlazorApi.cs to shared; use it from Analyzers test
* Fix incorrect test name
* Make as many parameters private as possible. Replace ILayoutComponent with BlazorLayoutComponent.
* In component tag helper discovery, consider private members too
* Reduce the work in component parameter discovery by not inspecting the BlazorComponent base class (or System.Object)
This change introduces ParameterAttribute to specify a bindable
component parameter. As of the 0.3 release of Blazor we plan to make
[Parameter] required to make a property bindable by callers.
This also applies to parameters when their value is set by the
infrastructure, such as `Body` for layouts, and route paramters.
The rationale behind this change is that we think there is a need to
separate the definition of properties from their suitability for a
caller to set them through markup. We plan to introduce more features in
this area in the future such as marking parameters as required. This is
first step, and we think that this approach will scale nicely as we add
more functionaly.
The 0.3 release seems like the right time to change this behavior since
we're also introducing `ref` for captures in this release.
Steve Sanderson
Ryan Nowak