Guild settings 1 (#19)

* start guild settings window, tweak style

dialogs/token.cpp

@@ -7,6 +7,7 @@ TokenDialog::TokenDialog(Gtk::Window &parent)
     , m_ok("OK")
     , m_cancel("Cancel") {
     set_default_size(300, 50);
+    get_style_context()->add_class("app-window");
 
     m_ok.signal_clicked().connect([&]() {
         m_token = m_entry.get_text();