Fix mesh colors for Andino

[IDavGal]

The generated proto does not translate the colors specified in the gazebo_description URDF. According to urdf2webots the material can be parsed from a list of gazebo materials defined in the package, but this does not seem to be working.

[IDavGal]

Update on colors not working:

• urdf2webots doesn't parse materials set by gazebo reference="link"
• It doesn't seem to work on materials defined outside of the link, such as the RVIZ material definition in macros' urdf for andino description
• urdf2webots' gazebo materials dictionary doesn't contain some of the colors andino uses (BlueGlow or Road for example)

Things that do work:

• Defining a reference to a color by name in a link and then referencing that on other links (i.e. base link defines blue as rgba="0 0 1 1", then camera_link can use just and it works)
• Setting a urdf2webots' compatible gazebo material for each frame (i.e. base_link material is Gazebo/Blue)

[IDavGal]

A workaround for this issue was implemented, adding a replacement for color definition for each link that requires it.

Additionally, an issue was opened in the urdf2webots repository to keep track of the package's solution for the problem.