Fixed broken tile/subdivs/polygon bounds/coordinates

+ do the coordinates left shift in a C++ standard defined way

src/common/garmin.h

@@ -3,14 +3,16 @@
 
 #include <QtGlobal>
 
+#define LS(val, bits) ((qint32)(((quint32)(val))<<(bits)))
+
 inline double toWGS32(qint32 v)
 {
-	return (double)(((double)v / (double)(1U<<31)) * (double)180);
+	return ((double)v / (double)(1U<<31)) * 180.0;
 }
 
 inline double toWGS24(qint32 v)
 {
-	return toWGS32(v<<8);
+	return toWGS32(LS(v, 8));
 }
 
 #endif // GARMIN_H