Move YGLogger into YGConfig and associate YGNodeRef with log events

Summary:
Moves the `YGLogger` into `YGConfig` and pass the `YGNodeRef` into the logger to be able to associate the log messages and assertions with the specific node.

Tackles facebook/yoga#530 and facebook/yoga#446
Closes https://github.com/facebook/yoga/pull/531

Reviewed By: astreet

Differential Revision: D4970149

Pulled By: emilsjolander

fbshipit-source-id: b7fcdaa273143ea2fa35861620b2e4d79f04f0af

yoga/YGEnums.h

@@ -87,13 +87,14 @@ typedef YG_ENUM_BEGIN(YGJustify) {
 } YG_ENUM_END(YGJustify);
 WIN_EXPORT const char *YGJustifyToString(const YGJustify value);
 
-#define YGLogLevelCount 5
+#define YGLogLevelCount 6
 typedef YG_ENUM_BEGIN(YGLogLevel) {
   YGLogLevelError,
   YGLogLevelWarn,
   YGLogLevelInfo,
   YGLogLevelDebug,
   YGLogLevelVerbose,
+  YGLogLevelFatal,
 } YG_ENUM_END(YGLogLevel);
 WIN_EXPORT const char *YGLogLevelToString(const YGLogLevel value);