Model:Samples USB-C Bracket

Used to mount a USB-C breakout inside an Elektron Model:Samples (and probably Model:Cycles -- untested) for an internal battery mod or just as an alternate DC input connector. Replaces the threaded insert bracket on the opposite end from the battery handle accessory's DC barrel jack.

More mod details are available on [this Reddit post](https://www.reddit.com/r/Elektron/comments/1fbesv0/elektron_modelsamples_internal_battery_mod).