Use new tools.analyzer features to simplify Eastwood linters

[jafingerhut]

Example suggested by Nicola:
defonce-or-defmulti-macro-expansion? could be written as

(some (fn [form]
        (and (seq? form)
             ('#{defonce defmulti} (first form))))
      (:raw-forms node))

Example interaction with tools.analyzer/analyze:

clojure.tools.analyzer.jvm> (-> (analyze '(defmulti x :op))
                                :raw-forms)

((defmulti x :op)
 (clojure.core/let [v__4114__auto__ (def x)]
   (clojure.core/when-not (clojure.core/and (.hasRoot v__4114__auto__)
                                            (clojure.core/instance? clojure.lang.MultiFn (clojure.core/deref v__4114__auto__)))
     (def x (new clojure.lang.MultiFn "x" :op :default #'clojure.core/global-hierarchy)))))

In general, :raw-forms is a sequence of forms, one for each 'level' of macroexpansion, until the last one in the sequence, where macroexpanding has no effect.

[jafingerhut]

From Nicola: if you need :raw-forms be sure to use 0.2.1/2-SNAPSHOT btw 0.2.0 had some passes that discarded it

[Bronsa]

@jafingerhut I'll have some the next week that I plan on dedicating to upgrading eastwood to the lastest t.a.jvm and polishing a bit the code to use the lastest features

[jafingerhut]

Nicola Mometto has committed these improvements some time back, with these commits:

Simplification & improvement in detection of defmulti and defonce forms: commit 9e46592

Similarly for defprotocol forms: commit 2509606