Use fbsource clang-format config

Summary:
This mirrors the clang-format config used by fbsource to Yoga.

They are pretty similar, except for an annoying habit where Yoga's previous forced small functions in headers to be a a single line, so you would get a combination of multiline and single line functions next to each other which are hard to read. That is what motivated this change.

It also enforces header ordering (yay). I don't think we have any side-effect causing headers, so this should be safe.

Reviewed By: yungsters

Differential Revision: D49248994

fbshipit-source-id: 66998395e7c0158ff9d9fb1bee44e8401bdd8f21

tests/YGAlignBaselineTest.cpp

@@ -44,8 +44,8 @@ static YGNodeRef createYGNode(
   if (alignBaseline) {
     YGNodeStyleSetAlignItems(node, YGAlignBaseline);
   }
-  YGNodeStyleSetWidth(node, (float) width);
-  YGNodeStyleSetHeight(node, (float) height);
+  YGNodeStyleSetWidth(node, (float)width);
+  YGNodeStyleSetHeight(node, (float)height);
   return node;
 }