SDF plugin for CoppeliaSim

SDF importer using libsdformat library.

Some features are not implemented yet.

Compiling

1. Install required packages for simStubsGen: see simStubsGen's README
2. Checkout, compile and install into CoppeliaSim:

$ git clone https://github.com/CoppeliaRobotics/simSDF.git
$ cd simSDF
$ git checkout coppeliasim-v4.5.0-rev0
$ mkdir -p build && cd build
$ cmake -DCMAKE_BUILD_TYPE=Release ..
$ cmake --build .
$ cmake --install .

NOTE: replace coppeliasim-v4.5.0-rev0 with the actual CoppeliaSim version you have.