new scripting functionality

* dofiles functions to run all scripts inside a directory
* new style option ! that evaluates its value from a lua code

src/framework/ui/uiwidget.cpp

@@ -461,6 +461,20 @@ void UIWidget::applyStyle(const OTMLNodePtr& styleNode)
 
     m_loadingStyle = true;
     try {
+        // translate ! style tags
+        for(const OTMLNodePtr& node : styleNode->children()) {
+            if(node->tag()[0] == '!') {
+                std::string tag = node->tag().substr(1);
+                std::string code = Fw::formatString("tostring(%s)", node->value().c_str());
+                std::string origin = "@" + node->source() + "[" + node->tag() + "]";
+                g_lua.evaluateExpression(code, origin);
+                std::string value = g_lua.popString();
+
+                node->setTag(tag);
+                node->setValue(value);
+            }
+        }
+
         onStyleApply(styleNode->tag(), styleNode);
         callLuaField("onStyleApply", styleNode->tag(), styleNode);
 
@@ -471,7 +485,6 @@ void UIWidget::applyStyle(const OTMLNodePtr& styleNode)
                 focus();
         }
         m_firstOnStyle = false;
-
     } catch(Exception& e) {
         logError("Failed to apply style to widget '", m_id, "' style: ", e.what());
     }