Added StaticJsonDocument and DynamicJsonDocument.

Removed StaticJsonArray and DynamicJsonArray.
Removed StaticJsonObject and DynamicJsonObject.
Removed StaticJsonVariant and DynamicJsonVariant.

test/DynamicJsonBuffer/size.cpp

@@ -2,9 +2,11 @@
 // Copyright Benoit Blanchon 2014-2018
 // MIT License
 
-#include <ArduinoJson.h>
+#include <ArduinoJson/Memory/DynamicJsonBuffer.hpp>
 #include <catch.hpp>
 
+using namespace ArduinoJson::Internals;
+
 TEST_CASE("DynamicJsonBuffer::size()") {
   DynamicJsonBuffer buffer;