Pillows and blankets

This adds:

[x] Down Blankets (warmer than regular ones)
[x] Pillows and Down Pillows
[ ] Make pillows and down pillows make falling asleep easier
[x] new item group: "bed" (also for future stuffed animals), spawns blankets and pillows (reduced spawn of blankets in general to compensate
[ ]implement "bed" group in all the houses, labs and stuff
[x] All items are craftable/uncraftable (down pillows/blankets needing/giving feathers)

Please tell me if some numbers or grammar are off, so I can fix it.