Ability to evaluate single, query, or col of script tags.

[chr15m]

Additional PR for #89 to address discussion here: #92

This adds the ability to pass either:

• a single script tag
• a col of script tags
• a querySelectorAll() of tags (NodeList or other JS array-like)
  into scittle.core.eval_script_tags() and have it do the right thing.

Tested like this (with hello.cljs and thing.cljs test scripts in the current dir):

(let [scripts (.querySelectorAll
                js/document
                "script[src='hello.cljs'],script[src='thing.cljs']")
      script (first scripts)]
  (js/console.log "scripts" scripts)
  ; load single tag
  (js/console.log "loading" (-> scripts first (aget "src")))
  (-> js/scittle
      .-core
      (.eval_script_tags script))
  ; load all the tags
  (js/console.log "loading all tags" scripts)
  (-> js/scittle
      .-core
      (.eval_script_tags scripts))
  ; load a js array of the scripts
  (js/console.log "loading all tags as js array")
  (-> js/scittle
      .-core
      (.eval_script_tags (js/Array.from scripts)))
  ; load a native clj seq of the scripts
  (js/console.log "loading all tags as vec")
  (-> js/scittle
      .-core
      (.eval_script_tags [(first scripts) (second scripts)])))

Please answer the following questions and leave the below in as part of your PR.

• I have read the developer documentation.

• This PR corresponds to an issue with a clear problem statement.

• I have updated the CHANGELOG.md file with a description of the addressed issue.

(Update to #89 and discussion so doesn't need a new CHANGELOG.md line I think).