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/client/hud/HUDElementHolding.java

@@ -2,7 +2,7 @@ package WayofTime.bloodmagic.client.hud;
 
 import WayofTime.bloodmagic.BloodMagic;
 import WayofTime.bloodmagic.item.sigil.ItemSigilHolding;
-import WayofTime.bloodmagic.registry.RegistrarBloodMagicItems;
+import WayofTime.bloodmagic.core.RegistrarBloodMagicItems;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.Gui;
 import net.minecraft.client.gui.ScaledResolution;