Zaweri's new reloading materials.

Appears to add solder, silver, bismuth and tin, for the purpose of using
them (along with gold) to reload casings of ammo. I didn't look too
closely, but did run jsonlint; direct any issues to Zaweri.
Empty commit, to test pull request jsonlint.
Add the new items to the spawn lists.
Fixes recipe category for iron javelins.
Merge more ammo materials and fix iron javelin category..