Buildcraft update

6.0.15 compatibility

-Blocks:

Updated blockDrillTexture; added diamond cb pipe, gates textures, iron power pipes (all previous work with bc5); added creative engine and wood/iron/stone chamber (no conflict with BC5, new textures)

Entities

added robots textures (works with bc5)

GUI

added filter_cb GUI, emerald pipe. updated gate guis (works with bc5)

-Items

added redstone comp chipset, redstone quartz chipset, red plasma bucket (in assets folder but unused in game at this time), redstone crystal (in assets folder but unused in game at this time), gate items and urbanist icons (all previous work with bc5)

Removed

Removed pipes/gates present in folder but unused in bc5/6 (for bc5 & 6)