Fix/read variable size matrices and optionals

Fixes the following issues:

• reading of MatrixXf was not possible. A memory copy failed as it was assumed that the Matrix was already initialized.
• reading of std::optional in NlohmannJsonReaderWithoutTypeCheck

source/RobotAPI/libraries/aron/codegeneration/test/CMakeLists.txt

@@ -106,6 +106,25 @@ armarx_add_test(
         ${Simox_INCLUDE_DIR}
 )
 
+######################
+# ARON JSON EXPORT TEST
+######################
+armarx_add_test(
+    TEST_NAME
+        aronJsonExportTest
+    TEST_FILE
+        aronJsonExportTest.cpp
+    LIBS
+        SimoxUtility  # Simox::SimoxUtility
+        ArmarXCore
+        RobotAPI::aron
+    ARON_FILES
+        aron/OptionalTest.xml
+        aron/MatrixTest.xml
+    INCLUDE_DIRECTORIES
+        ${Simox_INCLUDE_DIR}
+)
+
 ########################
 # ARON RANDOMIZED TEST #
 ########################