Pull apart excel code & get rid of reflections issues identified by lein check

Author: matthewdowney

project.clj

@@ -3,5 +3,6 @@
   :license {:name "Eclipse Public License"
             :url "http://www.eclipse.org/legal/epl-v10.html"}
   :dependencies [[org.clojure/clojure "1.10.0"]
+                 [rhizome "0.2.9"]
                  [org.apache.poi/poi-ooxml "4.0.0"]
                  [org.jodconverter/jodconverter-core "4.0.0-RELEASE"]])