container: finance: add lib_root impl (macro/plugin support)

- dfi's `root` now supports shell loading (and running) of
  macros/plugins:

  * An interactive ROOT.cern instance is no longer *always* needed:

    - For macros (non-server); a 'one-off' instance will start, load the
      given macro, run the macro and then the instance will exit.

      * Server(s) will maintain an interactive instance.

    - For plugins; an interactive instance will start, load the given
      plugin, and then leave the user to make their calls manually.

  * All repo macros and repo/custom plugins are available.

- By default, an interactive instance will start when no dfi `root`
  arguments are given.

See `root help` for details.

container/src/finance/lib/lib_finance.bash

@@ -90,6 +90,7 @@ function lib_finance::finance()
   source "${DOCKER_FINANCE_CONTAINER_REPO}/src/finance/lib/internal/lib_meta.bash" || exit 1
   source "${DOCKER_FINANCE_CONTAINER_REPO}/src/finance/lib/internal/lib_plugins.bash" || exit 1
   source "${DOCKER_FINANCE_CONTAINER_REPO}/src/finance/lib/internal/lib_reports.bash" || exit 1
+  source "${DOCKER_FINANCE_CONTAINER_REPO}/src/finance/lib/internal/lib_root.bash" || exit 1
   source "${DOCKER_FINANCE_CONTAINER_REPO}/src/finance/lib/internal/lib_taxes.bash" || exit 1
   source "${DOCKER_FINANCE_CONTAINER_REPO}/src/finance/lib/internal/lib_times.bash" || exit 1
 }
@@ -216,11 +217,7 @@ function lib_finance::reports()
 
 function lib_finance::root()
 {
-  # TODO: lib_root, add extendable arguments
-  lib_utils::deps_check "root"
-  # NOTE: will automatically load rootlogon.C
-  pushd "${DOCKER_FINANCE_CONTAINER_REPO}/src/root/macro" 1>/dev/null \
-    && root -l
+  lib_root::root "$@"
   lib_utils::catch $?
 }