Add support for wide panels.

Allows for panels to be displayed in single column mode, regardless of screen width.
For more information, see updates to README.md

src/ESPUI.cpp

@@ -825,6 +825,14 @@ void ESPUIClass::setElementStyle(uint16_t id, String style, int clientId)
     }
 }
 
+void ESPUIClass::setPanelWide(uint16_t id, bool wide) {
+    Control* control = getControl(id);
+    if (control)
+    {
+        control->wide = wide;
+    }
+}
+
 void ESPUIClass::updateControl(uint16_t id, int clientId)
 {
     Control* control = getControl(id);
@@ -1038,6 +1046,8 @@ Control* ESPUIClass::prepareJSONChunk(AsyncWebSocketClient* client, Control* con
             item["panelStyle"] = String(control->panelStyle);
         if (control->elementStyle != 0)
             item["elementStyle"] = String(control->elementStyle);
+        if (control->wide == true)
+            item["wide"] = true;
 
         if (control->parentControl != Control::noParent)
         {

src/ESPUI.h

@@ -139,6 +139,7 @@ public:
     String value;
     ControlColor color;
     bool visible;
+    bool wide;
     uint16_t parentControl;
     String panelStyle;
     String elementStyle;
@@ -154,6 +155,7 @@ public:
           value(value),
           color(color),
           visible(visible),
+          wide(false),
           parentControl(parentControl),
           next(nullptr)
     {
@@ -289,6 +291,8 @@ public:
     void setPanelStyle(uint16_t id, String style, int clientId = -1);
     void setElementStyle(uint16_t id, String style, int clientId = -1);
 
+    void setPanelWide(uint16_t id, bool wide);
+
     // Variables
     const char* ui_title = "ESPUI"; // Store UI Title and Header Name
     Control* controls = nullptr;