in_sidplaygr 1.0.0.0gr

This is a slightly modified version of in_sidplay (based on https://github.com/WACUP/in_sidplay2) and libsidplayfp (based on https://github.com/kode54/sidplay-residfp)

This release re-adds the sub song selection via seek bar since all the releases out there simply do not contain that functionality anymore.