specify clang for c++ formatting conventions

.github/pull_request_template.md

@@ -7,7 +7,7 @@
   is appreciated." This will allow other devs to potentially save you time by not accidentially duplicating work etc...
 - Please do not check in files that don't have real changes
 - Please do not reformat lines that you didn't have to change the code on
-- We recommend using the [Visual Studio Code](https://platformio.org/install/ide?install=vscode) editor,
+- We recommend using the [Visual Studio Code](https://platformio.org/install/ide?install=vscode) editor and the 'clang-format' extension,
   because automatically follows our indentation rules and it's auto reformatting will not cause spurious changes to lines.
 - If your PR fixes a bug, mention "fixes #bugnum" somewhere in your pull request description.
 - If your other co-developers have comments on your PR please tweak as needed.

.vscode/extensions.json

@@ -2,6 +2,7 @@
     // See http://go.microsoft.com/fwlink/?LinkId=827846
     // for the documentation about the extensions.json format
     "recommendations": [
-        "platformio.platformio-ide"
+        "platformio.platformio-ide",
+        "xaver.clang-format"
     ]
 }

.vscode/settings.json

@@ -77,5 +77,6 @@
             "--java_out=/tmp",
             "-I=/home/kevinh/development/meshtastic/meshtastic-esp32/proto"
         ]
-    }    
+    },
+    "editor.formatOnSave": true
 }