Implement smart conditional renders

[alexnm]

We had this implemented (#89 and #103) but with the new UIDL structure, this has to be thought differently. Perhaps we can have a step in the resolver that looks at boolean conditionals and decides if two conditionals which are one after another can be written in a smarter way:

• ternary in react: { condition ? (branch - true) : (branch - false)
• v-if/v-else in vue

[vladnicula]

Do you mean we could check UIDL and decide we can group conditionals together?

[alexnm]

yes, like a step before the pipeline processing