HackStudio: Add cpp debugger

The HackStudio debugger integrates with LibDebug to provide
source-level debugging.

The user can set breakpoints at various positions in the source code,
and then run the program in debug mode.

When the program is stopped, the current execution position is
displayed, and the user can insert/remove breakpoints, continue
execution, or single step the program.

DevTools/HackStudio/Project.h

@@ -56,6 +56,8 @@ public:
     ProjectType type() const { return m_type; }
     GUI::Model& model() { return *m_model; }
     String default_file() const;
+    String name() const { return m_name; }
+    String path() const { return m_path; }
 
     template<typename Callback>
     void for_each_text_file(Callback callback) const