evolve: move logic to continue interrupted content-div resolution to new fn
Each of the other type has defined their own function to continue/complete the
interrupted resolution. We take out the logic for content-div resolution too in
a separate function to make the top level function looks clean.
evolve: rename help topic evolve.interrupted-evolve to evolve.interrupted
`evolve.interrupted-evolve` has the word evolve twice. Now that this help topic
is a part of evolve command, evolve.interrupted will mean the interrupted evolve
command only.