build: More repo cleanup, move libimhex and external libs to /lib folder

lib/libimhex/include/hex/data_processor/link.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <hex.hpp>
+
+namespace hex::dp {
+
+    class Link {
+    public:
+        Link(u32 from, u32 to);
+
+        [[nodiscard]] u32 getID()     const { return this->m_id;   }
+        void setID(u32 id) { this->m_id = id; }
+
+        [[nodiscard]] u32 getFromID() const { return this->m_from; }
+        [[nodiscard]] u32 getToID()   const { return this->m_to;   }
+
+    private:
+        u32 m_id;
+        u32 m_from, m_to;
+    };
+
+}