Removing unused usages of clojure.reflect in order to remove this dependency

[irfn]

As discussed in Issue #349, I am removing various reflection methods which don't appear to be used anywhere.
PR is a simple removal of unused code scoped to the ones that are linked to usage of clojure.reflect

[irfn]

I didn't notice that CI was using maven. Will run maven for tests locally.

[irfn]

strange but the build passes locally using docker.
steps followed
docker build -f ./docker/Dockerfile . -t core.matrix-dev
docker run -it --entrypoint bash core.matrix-dev
this launches the shell
then run
mvn clean
mvn install -DskipTests=true -Dmaven.javadoc.skip=true
mvn test -B