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/YGMeasureTest.cpp

@@ -14,7 +14,7 @@ static YGSize _measure(
     YGMeasureMode /*widthMode*/,
     float /*height*/,
     YGMeasureMode /*heightMode*/) {
-  int* measureCount = (int*) YGNodeGetContext(node);
+  int* measureCount = (int*)YGNodeGetContext(node);
   if (measureCount) {
     (*measureCount)++;
   }
@@ -645,7 +645,6 @@ static YGSize _measure_90_10(
     YGMeasureMode /*widthMode*/,
     float /*height*/,
     YGMeasureMode /*heightMode*/) {
-
   return YGSize{90, 10};
 }
 
@@ -655,7 +654,6 @@ static YGSize _measure_100_100(
     YGMeasureMode /*widthMode*/,
     float /*height*/,
     YGMeasureMode /*heightMode*/) {
-
   return YGSize{100, 100};
 }