Update Containerfiles, start CLI tool.

+ Containerfiles: default to using g++.  Most of the dev machines aren't
  working with clang yet; until this is sorted out, they'll need to use
  g++.
+ Add script to determine if the git-tree is tagged.
+ Add basic CMake skeleton and start CLI tool.

Containerfile

@@ -1,9 +1,7 @@
 FROM docker.io/library/ubuntu:jammy
 LABEL maintainer="K. Isom <kyle@imap.cc>"
-
 ARG DEBIAN_FRONTEND=noninteractive
 ARG AUTOMATED_MODE=yes
-ARG USE_CLANG=yes
 ENV TZ=America/Los_Angeles
 
 # prepare build