[app-wiring-refactor]: Define external configuration

Mage.Common/src/main/java/mage/utils/FluentBuilder.java

@@ -0,0 +1,36 @@
+package mage.utils;
+
+import java.util.ArrayList;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+
+public abstract class FluentBuilder<ToBuild, RealBuilder extends FluentBuilder<ToBuild, RealBuilder>> {
+
+    final ArrayList<Consumer<RealBuilder>> buildSequence;
+    private final Supplier<RealBuilder> newReference;
+
+    protected FluentBuilder(Supplier<RealBuilder> newReference) {
+        this.buildSequence = new ArrayList<>();
+        this.newReference = newReference;
+    }
+
+    private RealBuilder copy() {
+        final RealBuilder realBuilder = newReference.get();
+        realBuilder.buildSequence.addAll(buildSequence);
+        return realBuilder;
+    }
+
+    protected abstract ToBuild makeValue();
+
+    public RealBuilder with(Consumer<RealBuilder> consumer) {
+        final RealBuilder nextBuilder = this.copy();
+        nextBuilder.buildSequence.add(consumer);
+        return nextBuilder;
+    }
+
+    public ToBuild build() {
+        final RealBuilder instance = this.copy();
+        instance.buildSequence.forEach(c -> c.accept(instance));
+        return instance.makeValue();
+    }
+}