Discussed with @Andrzej Ambroz (jendrzych) in Devtalk, the patch adds two new icons named RIGID_BODY and RIGID_BODY_CONSTRAINTS for use in the physics panel.
In the svg file they're positioned right to the force icons, in Q16 and Q17 respectively.
I'm not sure about the .dat files, I exported the diff with the --binary option, if that was not the best way to do this I can change it to a normal diff and provide the binaries within this description.
