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/util/PluginUtil.java

@@ -0,0 +1,36 @@
+package WayofTime.bloodmagic.util;
+
+import WayofTime.bloodmagic.apiv2.BloodMagicPlugin;
+import WayofTime.bloodmagic.apiv2.IBloodMagicPlugin;
+import com.google.common.collect.Lists;
+import net.minecraftforge.fml.common.discovery.ASMDataTable;
+import org.apache.commons.lang3.tuple.Pair;
+
+import javax.annotation.Nonnull;
+import java.util.List;
+import java.util.Set;
+
+public class PluginUtil {
+
+    @SuppressWarnings("unchecked")
+    @Nonnull
+    public static List<Pair<IBloodMagicPlugin, BloodMagicPlugin>> getPlugins(ASMDataTable dataTable) {
+        List<Pair<IBloodMagicPlugin, BloodMagicPlugin>> discoveredAnnotations = Lists.newArrayList();
+        Set<ASMDataTable.ASMData> discoveredPlugins = dataTable.getAll(BloodMagicPlugin.class.getCanonicalName());
+
+        for (ASMDataTable.ASMData data : discoveredPlugins) {
+            try {
+                Class<?> asmClass = Class.forName(data.getClassName());
+                Class<? extends IBloodMagicPlugin> pluginClass = asmClass.asSubclass(IBloodMagicPlugin.class);
+
+                IBloodMagicPlugin instance = pluginClass.newInstance();
+
+                discoveredAnnotations.add(Pair.of(instance, pluginClass.getAnnotation(BloodMagicPlugin.class)));
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+
+        return discoveredAnnotations;
+    }
+}