Inspector: Move everything into the Inspector namespace

DevTools/Inspector/RemoteObjectGraphModel.cpp

@@ -32,6 +32,8 @@
 #include <LibGUI/Application.h>
 #include <stdio.h>
 
+namespace Inspector {
+
 RemoteObjectGraphModel::RemoteObjectGraphModel(RemoteProcess& process)
     : m_process(process)
 {
@@ -118,3 +120,5 @@ void RemoteObjectGraphModel::update()
 {
     did_update();
 }
+
+}