feat: Model templates for color radios (update SD card for bundled templates) (#1569)

* Model templates - select and load after Create Model for color radios

* Model templates - save model as template, only for color radios

* Small fix to drawTextLines(...) to handle consecutive spaces

* Change title of button for empty template folder

* I found out why "no trailing slash = important" in path names!

* Reworked file and path name string manipulation
No longer using chdir, as Lua scripts etc. could be messing with the working dir
Use buffers more and std::string less

* Adjusting the size of buffers
I think that I got it right now. Really hard to figure out the right size constants!
Also added storageDirty(EE_MODEL) after reading the template file and renaming the model

* Added storage checks

* Slight simplification - all template buttons are similar

* Added "Blank Model" button

* Wizard Lua script
If there is a Lua script with the same name as the template file in the folder, then it is run after reading the template.

radio/src/storage/sdcard_common.cpp

@@ -29,11 +29,12 @@
 // defined either in sdcard_raw.cpp or sdcard_yaml.cpp
 void storageCreateModelsList();
 
-void getModelPath(char * path, const char * filename)
+void getModelPath(char * path, const char * filename, const char* pathName)
 {
-  strcpy(path, STR_MODELS_PATH);
-  path[sizeof(MODELS_PATH)-1] = '/';
-  strcpy(&path[sizeof(MODELS_PATH)], filename);
+  unsigned int len = strlen(pathName);
+  strcpy(path, pathName);
+  path[len] = '/';
+  strcpy(&path[len + 1], filename);
 }
 
 void storageEraseAll(bool warn)
@@ -142,6 +143,26 @@ const char* loadModel(char* filename, bool alarms)
   return nullptr;
 }
 
+const char* loadModelTemplate(const char* fileName, const char* filePath)
+{
+  preModelLoad();
+  // Assuming that the template is located in current working directory
+  const char* error = readModel(fileName, (uint8_t*)&g_model, sizeof(g_model), filePath);
+  if (error) {
+    TRACE("loadModel error=%s", error);
+    // just get some clean memory state in "g_model" so the mixer can run safely
+    memset(&g_model, 0, sizeof(g_model));
+    applyDefaultTemplate();
+
+    storageCheck(true);
+    postModelLoad(false);
+    return error;
+  }
+
+  postModelLoad(false);
+  return nullptr;
+}
+
 void storageReadAll()
 {
   TRACE("storageReadAll");