feat: support for vue sfc & target element click to next step

[Cameron-McBroom]

Ability to pass a single file component.

Usage

steps: [
  {
      component: {
	  vue: VButton,
	  content: `Hello World`,
          data: {
            type: "success"
	  },
	  listeners: {
	      click: () => { console.log("clicked button") }
          }
      }
  }
]

Ability to progress the tour when user clicks on target element:

Usage

steps: [
  {
      target: "#button-element",
      // Progresses to next step on click
      targetIsBtn: true
  },
  {
      target: "#button-element2",
      // custom callback
      targetIsBtn: () => { 
        console.log("custom function")
        // call nextstep manually in this case 
        this.$tours["myTour"].nextStep();
      }
  }
]

[LovaszNorbertM]

Can someone merge this? Please.