add additional alignment methods

Author: brachy84

src/main/java/com/cleanroommc/modularui/api/widget/IPositioned.java

@@ -366,14 +366,30 @@ default W alignX(float val) {
         return getThis();
     }
 
+    default W alignX(Alignment alignment) {
+        return alignX(alignment.x);
+    }
+
     default W alignY(float val) {
         topRel(val).anchorTop(val);
         return getThis();
     }
 
+    default W alignY(Alignment alignment) {
+        return alignY(alignment.y);
+    }
+
     default W align(Alignment alignment) {
-        return alignX(alignment.x).
-                alignY(alignment.y);
+        return alignX(alignment).
+                alignY(alignment);
+    }
+
+    default W horizontalCenter() {
+        return alignX(Alignment.CENTER);
+    }
+
+    default W verticalCenter() {
+        return alignY(Alignment.CENTER);
     }
 
     default W center() {

src/main/java/com/cleanroommc/modularui/utils/Alignment.java

@@ -23,6 +23,10 @@ public class Alignment {
     public static final Alignment BottomCenter = new Alignment(0.5f, 1, "BottomCenter");
     public static final Alignment BottomRight = new Alignment(1, 1, "BottomRight");
 
+    public static final Alignment START = TopLeft;
+    public static final Alignment CENTER = Center;
+    public static final Alignment END = BottomRight;
+
     public static final Alignment[] ALL = {
             TopLeft, TopCenter, TopRight,
             CenterLeft, Center, CenterRight,

src/main/java/com/cleanroommc/modularui/value/sync/GenericMapSyncHandler.java

@@ -108,6 +108,7 @@ public Map<K, V> getValue() {
     }
 
     public static class Builder<K, V> {
+
         private Supplier<Map<K, V>> getter;
         private Consumer<Map<K, V>> setter;
         private IByteBufDeserializer<K> keyDeserializer;