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/api_impl/BloodMagicAPI.java

@@ -0,0 +1,56 @@
+package WayofTime.bloodmagic.api_impl;
+
+import WayofTime.bloodmagic.api.altar.EnumAltarComponent;
+import WayofTime.bloodmagic.apiv2.IBloodMagicAPI;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.util.ResourceLocation;
+
+import java.util.Map;
+
+public class BloodMagicAPI implements IBloodMagicAPI {
+
+    public static final BloodMagicAPI INSTANCE = new BloodMagicAPI();
+
+    private final BloodMagicBlacklist blacklist;
+    private final Map<ResourceLocation, Integer> sacrificialValues;
+    private final Map<IBlockState, EnumAltarComponent> altarComponents;
+
+    public BloodMagicAPI() {
+        this.blacklist = new BloodMagicBlacklist();
+        this.sacrificialValues = Maps.newHashMap();
+        this.altarComponents = Maps.newHashMap();
+    }
+
+    @Override
+    public BloodMagicBlacklist getBlacklist() {
+        return blacklist;
+    }
+
+    @Override
+    public void setSacrificialValue(ResourceLocation entityId, int value) {
+        sacrificialValues.put(entityId, value);
+    }
+
+    @Override
+    public void registerAltarComponent(IBlockState state, String componentType) {
+        EnumAltarComponent component = EnumAltarComponent.NOTAIR;
+        for (EnumAltarComponent type : EnumAltarComponent.VALUES) {
+            if (type.name().equalsIgnoreCase(componentType)) {
+                component = type;
+                break;
+            }
+        }
+
+        altarComponents.put(state, component);
+    }
+
+    public Map<ResourceLocation, Integer> getSacrificialValues() {
+        return ImmutableMap.copyOf(sacrificialValues);
+    }
+
+    public Map<IBlockState, EnumAltarComponent> getAltarComponents() {
+        return ImmutableMap.copyOf(altarComponents);
+    }
+}