added calibration to buffer; separated buffer and wind code in opb60task; prepared simulation; getMin/Max fix for ringbuffer for invalid data; fix for chart center; cleanup code

lib/obp60task/config.json

@@ -219,6 +219,17 @@
             "obp60":"true"
         }
     },
+    {
+        "name": "calcTrueWnds",
+        "label": "Calculate True Wind",
+        "type": "boolean",
+        "default": "false",
+        "description": "If not available, calculate true wind data from appearant wind and other boat data",
+        "category": "OBP60 Settings",
+        "capabilities": {
+            "obp60": "true"
+        }
+    },
     {
         "name": "lengthFormat",
         "label": "Length Format",