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

lib/libimhex/source/data_processor/attribute.cpp

@@ -0,0 +1,16 @@
+#include <hex/data_processor/attribute.hpp>
+
+#include <hex/helpers/shared_data.hpp>
+
+namespace hex::dp {
+
+    Attribute::Attribute(IOType ioType, Type type, std::string unlocalizedName) : m_id(SharedData::dataProcessorAttrIdCounter++), m_ioType(ioType), m_type(type), m_unlocalizedName(std::move(unlocalizedName)) {
+
+    }
+
+    Attribute::~Attribute() {
+        for (auto &[linkId, attr] : this->getConnectedAttributes())
+            attr->removeConnectedAttribute(linkId);
+    }
+
+}