restructure into smaller files & add IWYU/clang-tidy

Signed-off-by: Folling <mail@folling.io>

src/objects/object.cpp

@@ -0,0 +1,27 @@
+#include "ikarus/objects/object.h"
+
+#include <initializer_list>
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <ikarus/objects/object_type.h>
+
+IkarusObjectType ikarus_object_get_type(IkarusObject object) {
+    return object.type;
+}
+
+TEST_CASE("object_type", "[object]") {
+    auto types = {
+        IkarusObjectType_Blueprint,
+        IkarusObjectType_Property,
+        IkarusObjectType_Entity,
+        IkarusObjectType_BlueprintFolder,
+        IkarusObjectType_PropertyFolder,
+        IkarusObjectType_EntityFolder,
+    };
+
+    for (auto type : types) {
+        auto object = IkarusObject{.type = type};
+        REQUIRE(ikarus_object_get_type(object) == type);
+    }
+}