Add (py)collimator to the tools list

[jp-andre]

Add Collimator and our companion Python package pycollimator to the list of tools.

As a web platform, interface was set to GUI and platforms to all of them.

[chrbertsch]

It would be great if you could provide provide compatibility information (see https://github.com/modelica/fmi-standard.org/blob/main/CONTRIBUTING.md#compatibility-information), i.e. how you tested your FMI implementation? (Could also be in a separate Pull Request.)
Benefit: your tool will get the "yellow star" and be listed on the top.

[jp-andre]

It would be great if you could provide provide compatibility information (see https://github.com/modelica/fmi-standard.org/blob/main/CONTRIBUTING.md#compatibility-information), i.e. how you tested your FMI implementation? (Could also be in a separate Pull Request.) Benefit: your tool will get the "yellow star" and be listed on the top.

This looks like it could be very valuable information indeed. As it might take a bit more time to compile this data, I will take a note to open another PR here. Thanks! (and I assume someone else will come and click the merge button on this PR)