Implement TitleColor property in PickerHandlers

[jsuarezruiz]

Description of Change

Implement TitleColor property in PickerHandlers.

Platforms Affected

• Core
• iOS
• Android

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)
• Targets a single property for a single control (or intertwined few properties)
• Adds the property to the appropriate interface
• Avoids any changes not essential to the handler property
• Adds the mapping to the PropertyMapper in the handler
• Adds the mapping method to the Android, iOS, and Standard aspects of the handler
• Implements the actual property updates (usually in extension methods in the Platform section of Core)
• Tags ported renderer methods with [PortHandler]
• Adds an example of the property to the sample project (MainPage)
• Adds the property to the stub class
• Implements basic property tests in DeviceTests

[hartez]

This should be a Brush.

[jsuarezruiz]

Totally agree. However, can we make it progressive? Start by merging this and other PRs related to Color, in order to complete Handlers and allow in Previews to work and port code in a simple way, and as we have to do with other important properties such as convert TextColor to Foreground, update little by little .

[hartez]

Yeah, we can do that.

[hartez]

Yeah, we can do that.