move all hooks into surface components so they can be assembled/loaded automatically per-flavour

[mayel]

eg.

export default {
  mounted(){
...
  }
}

and <div id="my_div" :hook>

or with multiple:

let PreviewActivity = {
...
}
let ClosePreview = {
...
}
export { PreviewActivity, ClosePreview }

and <div :hook="PreviewActivity">

Related to #707

[mayel]

done for all hooks in classic except for the generic copy and tooltip
still keeping per-flavour deps_hooks.js for now in case still needed (and because other flavours also have some hooks still using it)

note one workaround to have in mind: have to put paths to node_modules where JS deps may be found in ./assets/package.json like this NODE_PATH=./node_modules:../../../deps/bonfire_editor_milkdown/assets/node_modules