Global Translation/Rotation handles

[DavidMansolino]

trafficstars

Currently, the rotation and translation handles use the object coordinate system, however, it is very often useful to translate/rotate the object using the world coordinate system.

For example if you want to switch the orientation from NUE to ENU world coordinate system should be used. For example in then khepera3_gripper world, if you want to switch from NUE to ENU, you need to rotate the WoodenBox along with the 1.57 rad along the X-axis, but since they are already rotated along the Y-axis, this is a non-trivial task.

One 'simple' solution would be to use a keyboard modifier, for example as long as the Ctrl key is pressed, the handles switch to global coordinate system.

Such a feature will greatly simplify the process to convert a world file.