Golemancy

Changelog:

• Added obsidian effigies, made from obsidian and crying obsidian. They are similar to terracotta golems, but are completely immune to fire and lava.
• Effigies are now placed down as a block, rather than an entity. Otherwise, they work exactly the same.
• Entropic golems now emit smoke particles when their target block is too hard to break.
• Add support for Croparia/Stemaria to Verdant golems (thanks to @shanks3042 for pull request).
• Add support for Companions mod (thanks to @Sirkilium for bug report).
• Improve golem AI and pathfinding (thanks to @Sirkilium for bug report).