Mantis toolhead Dragon/Rapido UHF neopixel ducts

Modified crazy ducts from Mantis github: they are 8.5mm lower to accommodate Dragon/Rapido UHF and added mounts for neopixels.

Rest of the toolhead can be found here: https://github.com/VoronDesign/VoronUsers/tree/master/printer_mods/Long/Mantis_Dual_5015