Implement interface for plugins to have custom UI Frames

src/mesh/MeshPlugin.cpp

@@ -75,4 +75,18 @@ void MeshPlugin::sendResponse(const MeshPacket &req) {
 void setReplyTo(MeshPacket *p, const MeshPacket &to) {
     p->to = to.from;
     p->want_ack = to.want_ack;
-}
+}
+
+std::vector<MeshPlugin *> MeshPlugin::GetMeshPluginsWithUIFrames() {
+
+    std::vector<MeshPlugin *> pluginsWithUIFrames;    
+    for (auto i = plugins->begin(); i != plugins->end(); ++i) {
+        auto &pi = **i;
+        if ( pi.wantUIFrame()) {
+            DEBUG_MSG("Plugin wants a UI Frame\n");
+            pluginsWithUIFrames.push_back(&pi);
+        }
+    }
+    return pluginsWithUIFrames;
+    
+}

src/mesh/MeshPlugin.h

@@ -2,6 +2,8 @@
 
 #include "mesh/MeshTypes.h"
 #include <vector>
+#include <OLEDDisplay.h>
+#include <OLEDDisplayUi.h>
 /** A baseclass for any mesh "plugin".
  *
  * A plugin allows you to add new features to meshtastic device code, without needing to know messaging details.
@@ -14,7 +16,7 @@
  */
 class MeshPlugin
 {
-    static std::vector<MeshPlugin *> *plugins;
+  static std::vector<MeshPlugin *> *plugins;
 
   public:
     /** Constructor
@@ -28,6 +30,10 @@ class MeshPlugin
      */
     static void callPlugins(const MeshPacket &mp);
 
+    static std::vector<MeshPlugin *> GetMeshPluginsWithUIFrames();
+
+    virtual void drawFrame(OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y) { return; }
+
   protected:
     const char *name;
 
@@ -61,6 +67,13 @@ class MeshPlugin
      * so that subclasses can (optionally) send a response back to the original sender.  */
     virtual MeshPacket *allocReply() { return NULL; }
 
+    /***
+     * @return true if you want to be alloced a UI screen frame
+     */
+    virtual bool wantUIFrame() { return false; }
+
+
+
   private:
 
     /** Messages can be received that have the want_response bit set.  If set, this callback will be invoked