Add tooltips for building buttons and module selection buttons

src/ui/BuildButtonGrid.cpp

@@ -42,6 +42,10 @@ BuildButtonGrid::BuildButtonGrid(const GameConfig* config, QWidget* parent)
         QPushButton* btn = new QPushButton(label, this);
         btn->setCheckable(true);
         btn->setFixedHeight(48);
+        if (def.tooltip)
+        {
+            btn->setToolTip(QString::fromStdString(*def.tooltip));
+        }
         layout->addWidget(btn, row, col);
 
         const int idx = static_cast<int>(m_buttons.size());