Move commonly used API systems to a plugin based system

Create a class that implements IBloodMagicPlugin and annotate it with
`@BloodMagicPlugin`. The `register` method will be called during init.

Currently implemented systems:
- Blacklisting
  - Teleposer
  - Teleposer (entity)
  - Transposition
  - Well of Suffering
  - Green Grove
- Setting sacrificial values
- Adding altar components

src/main/java/WayofTime/bloodmagic/entity/projectile/EntityBloodLight.java

@@ -1,7 +1,7 @@
 package WayofTime.bloodmagic.entity.projectile;
 
 import WayofTime.bloodmagic.api.Constants;
-import WayofTime.bloodmagic.registry.RegistrarBloodMagicBlocks;
+import WayofTime.bloodmagic.core.RegistrarBloodMagicBlocks;
 import io.netty.buffer.ByteBuf;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityLivingBase;