refactor: Refactorized whole project structure

source/classes/CMakeLists.txt

@@ -0,0 +1,17 @@
+
+target_sources(${PYG2O_MODULE_NAME}
+    PRIVATE
+        squirrel/Daedalus.cpp
+        squirrel/DamageDescription.cpp
+        squirrel/ItemGround.cpp
+        squirrel/ItemsGround.cpp
+        squirrel/Mds.cpp
+        squirrel/Packet.cpp
+        squirrel/Sky.cpp
+        squirrel/Way.cpp
+)
+
+target_include_directories(${PYG2O_MODULE_NAME}
+    PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}/
+)