Merge remote-tracking branch 'upstream/ver/6.0.0' into architecture/slf4j-logging

# Conflicts:
#	common/api/core/src/main/java/com/dfsek/terra/api/Logger.java

common/api/core/build.gradle.kts

@@ -1,5 +1,7 @@
 dependencies {
-    "shadedApi"("com.dfsek:Paralithic:0.4.0")
+    "shadedApi"(project(":common:api:util"))
+    
+    "shadedApi"("com.dfsek:Paralithic:0.5.0")
     
     "shadedApi"("com.dfsek.tectonic:common:2.1.2")
     

common/api/core/src/main/java/com/dfsek/terra/api/addon/Addon.java

@@ -0,0 +1,4 @@
+package com.dfsek.terra.api.addon;
+
+public interface Addon {
+}

common/api/core/src/main/java/com/dfsek/terra/api/addon/AddonLoader.java

@@ -0,0 +1,13 @@
+package com.dfsek.terra.api.addon;
+
+import com.dfsek.terra.api.TerraPlugin;
+import com.dfsek.terra.api.registry.CheckedRegistry;
+
+
+public interface AddonLoader {
+    /**
+     * Load all addons.
+     * @param main TerraPlugin instance.
+     */
+    void load(TerraPlugin main, CheckedRegistry<Addon> addons);
+}