Resolve L2SS-218 "Move existing tooling to bootstrap dir"

This is the beginning.

Closes L2SS-218

bootstrap/bin/updatePythonEnv.sh

+#! /usr/bin/env bash
+
+venv=${VIRTUAL_ENV:?This is currently not a Python3 venv!  Will not upgrade venv packages.}
+echo -e "\nFound a Python3 venv in \"${VIRTUAL_ENV}\".\nWill now proceed with package upgrades.\n"
+
+pip="python3 -m pip"
+upgrade_command="${pip} install --upgrade"
+
+if [ -z ${OS} ]; then
+    OS=$(uname)
+fi
+if [ ${OS} = Darwin ]; then
+    find=gfind
+else
+    find=find
+fi
+
+function upgrade()
+{
+    if [ ${#} -ge 1 ]; then
+        echo "Upgrading ${@}..."
+        ${upgrade_command} ${@}
+        if [ ${?} -eq 0 ]; then
+            echo -e "\nUpgrading ${@} done.\n\nNow \"deactivate\" and \"source ${venv}/bin/activate\".\n"
+        else
+            echo -e "\nSomething went wrong during the upgrade.\nCheck the output!\n"
+        fi
+    else
+        echo -e "\nNo package for upgrading given.\n"
+    fi
+}
+
+upgrade pip wheel
+
+installed_packages=$(for i in $(python3 -m pip freeze | cut -d'=' -f1); do printf "%s " ${i}; done)
+upgrade ${installed_packages}