Added support for slots in dynamic modal - Fixes #400

[kaguya3222]

Made it possible to pass slots to dynamic modals.

For example, we have a modal component - ExampleModal

If we want to call it dynamically, we'll do something like:

this.$modal.show(ExampleModal)

But if ExampleModal has slots, for example:

<template>
  <div>
    <slot />
  </div>
</template>

We can pass slots like this:

this.$modal.show(ExampleModal, {}, {
  default: this.$createElement('span', 'message')
})

If we have scoped slots, for example:

<template>
  <div>
    <slot name="test" :number="42" />
  </div>
</template>

We can pass them like:

this.$modal.show(ExampleModal, {}, {
 test: scope => this.$createElement('span', `Number: ${scope.number}`)
})

[sonarcloud[bot]]

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[euvl]

Hey, this looks very clean, well done!

I am looking for maintainers for this project who are actively using Vue (i have not used it much in recent years) If you are interested to help me out - please ping me at yev.dev@gmail.com

[mooncastlestone]

Is this working now? I tried it a few times, but it's not working properly..