FEAT,IMPRO: added linkBorder functionallity

src/modifier.js

@@ -193,6 +193,18 @@ class Modifier {
             return new ShapeChain(this).all(cornerRadius);
         }
     }
+
+    /**
+     * 
+     * @param {number} borderWidth sets the width of all four border sides
+     * @returns {BorderChain}
+     */
+    linkBorder(borderWidth = -1) {
+        if (borderWidth === -1) {
+            return new BorderChain(this);
+        } else {
+            return new BorderChain(this).all(borderWidth);
+        }
     }
 
     /**

src/sizeSide/border.js

@@ -159,4 +159,52 @@ class Border extends Sides {
                 ]
             })
     }
-}  
+}
+
+
+class BorderChain extends Border {
+    constructor(modifier){
+        super();
+        this._modifier = modifier;
+    }
+
+    /**
+     * 
+     * @returns {Modifier|ChainableModifier}
+     */
+    toModifier() {
+        return this._modifier
+            .border(this);
+    }
+
+    /**
+     * 
+     * @returns {Modifier|ChainableModifier}
+     */
+    ensureModifier() {
+        return this.toModifier()
+    }
+
+    /**
+     * Applies the border modification on the modifier
+     * and returns (through the modifier) to the corresponding component. 
+     * @returns {Component}
+     */
+    toComponent() {
+        return this._modifier
+            .dimensions(this)
+            .toComponent();
+    }
+
+    /**
+     * 
+     * @param {Component} innerComponent will be set to the corresponding component
+     * @returns {Component} the corr. Component after the childContext was applied. 
+     */
+    childContext(innerComponent) {
+        return this._modifier
+            .dimensions(this)
+            .toComponent()
+            .childContext(innerComponent);
+    }
+}