urdf.xacro should be reserved for files that generate a valid URDF description.

[galou]

Describe the the feature you would like

By convention, files with the suffix .urdf.xacro should be reserved for files that will allow to generate a valid URDF description, i.e. files xacro will be called with. Files that only define macros should be called .xacro or _macro.xacro. So, tower_sensor_plate.urdf.xacro, tower_standoff.urdf.xacro, and weight_block.urdf.xacro should be renamed tower_sensor_plate.xacro, tower_standoff.xacro, and weight_block.xacro.

Other notes

I can do the changes.

[hilary-luo]

Go ahead and make a PR, thanks