Deprecate "StyleLayer#paint" and "StyleLayer#layout"

[lucaswoj]

StyleLayer#paint and StyleLayer#layout do not accommodate for data-driven styling. Any code that uses these properties probably doesn't accommodate for data-driven styling either. We should deprecate these properties in favor of StyleLayer#getPaintValue and StyleLayer#getLayoutValue. This might be done in conjunction with #2739.

cc @davidtheclark

[davidtheclark]

@lucaswoj So this is the root of the problem I was seeing? — that queryRenderedFeatures seemed to always look for circles that are as large as they might be instead of as large as they actually are?

[lucaswoj]

@davidtheclark Worse, actually. queryRenderedFeatures assumed all circles were the size specified in the first function stop 😬

[jfirebaugh]

I think we need to do this before adding further data-driven properties -- it's hiding a lot of bugs.