refactor(furvm): introduce a furvm.hpp header

Refs: #12

furvm/include/furvm/furvm.hpp

@@ -0,0 +1,12 @@
+#ifndef FURVM_HPP
+#define FURVM_HPP
+
+#include "furvm/context.hpp"     // IWYU pragma: export
+#include "furvm/executor.hpp"    // IWYU pragma: export
+#include "furvm/function.hpp"    // IWYU pragma: export
+#include "furvm/fwd.hpp"         // IWYU pragma: export
+#include "furvm/handle.hpp"      // IWYU pragma: export
+#include "furvm/instruction.hpp" // IWYU pragma: export
+#include "furvm/thing.hpp"       // IWYU pragma: export
+
+#endif // FURVM_HPP

furvm/src/main.cpp

@@ -1,12 +1,6 @@
 #ifndef LIBFURVM
 
-#include "furvm/context.hpp"
-#include "furvm/executor.hpp"
-#include "furvm/function.hpp"
-#include "furvm/fwd.hpp"
-#include "furvm/instruction.hpp"
-#include "furvm/module.hpp"
-#include "furvm/thing.hpp"
+#include "furvm/furvm.hpp"
 
 #include <array>
 #include <cstddef>