ArduinoJson 6.6.0-beta * Removed `JsonArray::is<T>(i)` and `JsonArray::set(i,v)` * Removed `JsonObject::is<T>(k)` and `JsonObject::set(k,v)` * Replaced `T JsonArray::get<T>(i)` with `JsonVariant JsonArray::get(i)` * Replaced `T JsonObject::get<T>(k)` with `JsonVariant JsonObject::get(k)` * Added `JSON_STRING_SIZE()` * Replacing or removing a value now releases the memory * Added `DeserializationError::code()` to be used in switch statements (issue #846)