apply style guide

interfaces/SimpleScene/SimpleScene.proto

 syntax = "proto3";
 
 message IposConfig {
-    repeated IposFrame frame = 1;
-    repeated IposObject object = 2;
+    repeated IposFrame frames = 1;
+    repeated IposObject objects = 2;
 }
 
 message IposPositionUpdate {
-  repeated IposObject object = 1;
+  repeated IposObject objects = 1;
 }
 
 message IposObject {
 
   // required:
   string id = 1; // unique for each object, but there may be multiple sensors
-  string sensorId = 2; // unique
+  string sensor_id = 2; // unique
   string type = 3; // Applications may send BOX,BIN,ZONE,ROBOT,HUMAN,OTHER
 
   // optional:
   IposRelativePosition position = 4;
   IposSimpleOrientation orientation = 5;
-  string lastPosUpdate = 6; // https://en.wikipedia.org/wiki/ISO_8601
+  string last_pos_update = 6; // https://en.wikipedia.org/wiki/ISO_8601
 
 }
 
@@ -32,7 +32,7 @@ message IposFrame {
 
 // relative coordinates
 message IposRelativePosition {
-  string IposFrame_id = 1;
+  string frame_id = 1;
   IposPosition pos = 2;
 }