restructure into smaller files & add IWYU/clang-tidy

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

include/ikarus/objects/blueprint.h

@@ -0,0 +1,24 @@
+#pragma once
+
+/// \file blueprint.h
+/// \author Folling <mail@folling.io>
+
+#include <ikarus/id.h>
+#include <ikarus/macros.h>
+
+/// \defgroup blueprints Blueprints
+/// \brief Blueprints are templates for entities.
+
+IKARUS_BEGIN_HEADER
+
+/// \brief A blueprint object.
+/// \details  A blueprint is a collection of properties which can be linked to entities.
+/// Each entity the blueprint is linked to will have values for the blueprints properties.
+struct IkarusBlueprint {
+    /// \private \brief The id of the blueprint.
+    IkarusId id;
+};
+
+IKARUS_END_HEADER
+
+// @}