CI: Update build scripts and Github actions workflow

Also updates main CMakeLists.txt and CMakeLists.txt for unit tests,
also adds additional build directories to .gitignore file

CI/include/build_support_freebsd.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+##############################################################################
+# FreeBSD support functions
+##############################################################################
+#
+# This script file can be included in build scripts for FreeBSD.
+#
+##############################################################################
+
+# Setup build environment
+
+if [ "${TERM-}" -a -x /usr/local/bin/tput ]; then
+    COLOR_RED=$(/usr/local/bin/tput setaf 1)
+    COLOR_GREEN=$(/usr/local/bin/tput setaf 2)
+    COLOR_BLUE=$(/usr/local/bin/tput setaf 4)
+    COLOR_ORANGE=$(/usr/local/bin/tput setaf 3)
+    COLOR_RESET=$(/usr/local/bin/tput sgr0)
+else
+    COLOR_RED=""
+    COLOR_GREEN=""
+    COLOR_BLUE=""
+    COLOR_ORANGE=""
+    COLOR_RESET=""
+fi
+
+if [ "${CI}" -o "${QUIET}" ]; then
+    export CURLCMD="curl --silent --show-error --location -O"
+else
+    export CURLCMD="curl --progress-bar --location --continue-at - -O"
+fi
+
+_add_ccache_to_path() {
+    if [ "${CMAKE_CCACHE_OPTIONS}" ]; then
+        PATH="/usr/local/opt/ccache/libexec:${PATH}"
+        status "Compiler Info:"
+        local IFS=$'\n'
+        for COMPILER_INFO in $(type cc c++ gcc g++ clang clang++ || true); do
+            info "${COMPILER_INFO}"
+        done
+    fi
+}