feat: resolve template element having control directives

[ktsn]

v-if, v-else, v-else-if and v-for can be used on <template> element and the rendered html will not have the element. It expands the children of the <template>.

References:

• https://vuejs.org/v2/guide/conditional.html#Conditional-Groups-with-v-if-on-lt-template-gt
• https://vuejs.org/v2/guide/list.html#v-for-on-a-lt-template-gt