Grenades recipe pack.

1. Allow duct tape to be used in grenade recipe.
2. Allow grenade disassembly.
3. Incendiary grenade recipe.
4. Flashbang recipe.
5. Allow EMP grenade disassembly.
6. Scrambler grenade recipe.
7. Firecracker recipe.
8. Firecracker pack recipe.
fix
Disable autolearn.
Merge branch 'explosive' of https://github.com/Darkyhard/Cataclysm-DDA into kaboom
Nerf pipe bomb crafting time

42 seconds seemed WAY quick given the typical crafting times.  This
should be 5 minutes.