refactor(Mouse class): adapt and rename getScrollDistance() method

BREAKING CHANGE: `getScrollDistance()` is now `wheel().query()`.

src/inputs/mouse.spec.ts

@@ -145,25 +145,37 @@ describe('The `Mouse` class', () => {
 
   })
 
-  describe('should have a `getScrollDistance()` method that', () => {
+  describe('should have a `wheel()` method that returns a component that', () => {
 
-    it('returns `0` if no scrolling occurred', () => {
-      expect(mouse.getScrollDistance()).to.equal(0)
+    it('returns the correct label', () => {
+      expect(mouse.wheel().label).to.equal('Mouse wheel')
     })
 
-    it('returns the correct distance after scrolling occurred', () => {
-      canvas.listeners.wheel({ deltaY: 4 })
-      expect(mouse.getScrollDistance()).to.equal(4)
+    it('returns the correct icon', () => {
+      expect(mouse.wheel().icons[0]).to.equal('mouse-wheel')
     })
 
-    it('returns `0` after distance was queried', () => {
-      expect(mouse.getScrollDistance()).to.equal(0)
-    })
+    describe('when queried', () => {
+
+      it('returns `0` if no scrolling occurred', () => {
+        expect(mouse.wheel().query()).to.equal(0)
+      })
+
+      it('after scrolling occurred, returns the correct distance', () => {
+        canvas.listeners.wheel({ deltaY: 4 })
+        expect(mouse.wheel().query()).to.equal(4)
+      })
+
+      it('after last movement was queried, returns `0`', () => {
+        expect(mouse.wheel().query()).to.equal(0)
+      })
+
+      it('after scrolling occurred multiple times, returns the total distance', () => {
+        canvas.listeners.wheel({ deltaY: 8 })
+        canvas.listeners.wheel({ deltaY: 3 })
+        expect(mouse.wheel().query()).to.equal(11)
+      })
 
-    it('returns the total distance after scrolling occurred multiple times', () => {
-      canvas.listeners.wheel({ deltaY: 8 })
-      canvas.listeners.wheel({ deltaY: 3 })
-      expect(mouse.getScrollDistance()).to.equal(11)
     })
 
   })

src/inputs/mouse.ts

@@ -93,10 +93,16 @@ export class Mouse {
     }
   }
 
-  public getScrollDistance() {
-    const distance = this.scrollDistance
-    this.scrollDistance = 0
-    return distance
+  public wheel() {
+    return {
+      label: 'Mouse wheel',
+      icons: ['mouse-wheel'],
+      query: () => {
+        const distance = this.scrollDistance
+        this.scrollDistance = 0
+        return distance
+      },
+    }
   }
 
   public lockPointer() {