AP_Terrain: move location_update to Location and rename to offset_bearing

libraries/AP_Terrain/AP_Terrain.cpp

@@ -271,7 +271,7 @@ float AP_Terrain::lookahead(float bearing, float distance, float climb_ratio)
 
     // check for terrain at grid spacing intervals
     while (distance > 0) {
-        location_update(loc, bearing, grid_spacing);
+        loc.offset_bearing(bearing, grid_spacing);
         climb += climb_ratio * grid_spacing;
         distance -= grid_spacing;
         float height;

libraries/AP_Terrain/AP_Terrain.h

@@ -17,6 +17,7 @@
 #include <AP_Common/AP_Common.h>
 #include <AP_HAL/AP_HAL.h>
 #include <AP_Logger/AP_Logger.h>
+#include <AP_Common/Location.h>
 
 #if (HAL_OS_POSIX_IO || HAL_OS_FATFS_IO) && defined(HAL_BOARD_TERRAIN_DIRECTORY)
 #define AP_TERRAIN_AVAILABLE 1

libraries/AP_Terrain/TerrainMission.cpp

@@ -82,7 +82,7 @@ void AP_Terrain::update_mission_data(void)
         // spacings away at 45, 135, 225 and 315 degrees, and the
         // point itself
         if (next_mission_pos != 4) {
-            location_update(cmd.content.location, 45+90*next_mission_pos, grid_spacing.get() * 10);
+            cmd.content.location.offset_bearing(45+90*next_mission_pos, grid_spacing.get() * 10);
         }
 
         // we have a mission command to check