Add the ability to extract styles from an element

[mrlacey]

When the properties of an element have been changed it would be great to be able to extract those values to a style that can then easily be applied to other elements.

#SuggestedAtBuild

[mrlacey]

This is a great idea and manipulating styles is a wonderful way of working with the XAML Analysis capabilities.

Analyzing styles is already documented as #138 but this would be a great way to begin work in this area.

My initial thought is to extract the style to the document level until support the ability to work with multiple files (#136)

Need to consider/define:

• What element to apply this to. Can it be all?
• Which properties of those elements?
• How to name the generated styles? and how to avoid naming collisions?

[mrlacey]

If extract at the file-level, it also makes sense to be able to group the ability to apply a style from the file to an element in that file.

Individual parser, therefore, needs to know about resources in that file. This will necessitate a new capability within an XamlElementProcessor.

Automatically applying a created style to other elements in the same file can initially be a two-step process. Extracting the resource and automatically applying it everywhere can be a future task.