implement game configuration file

this integrates https://github.com/cktan/tomlc99 into the repo as a dependency

third-party/tomlc99/test2/.gitignore

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+/toml-spec-tests

third-party/tomlc99/test2/Note.txt

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+Note that we utilize the 'jq' command to normalize json files for comparison. Depending the
+verson of jq on your system, some tests may generate error that looks like this:
+
+   parse error: Exceeds depth limit for parsing at line 1
+
+This is an error in 'jq', and it does not indicate that the tests themselves fail.

third-party/tomlc99/test2/build.sh

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+#!/usr/bin/env bash
+
+set -e
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+[ -d toml-spec-tests ] || git clone https://github.com/cktan/toml-spec-tests.git

third-party/tomlc99/test2/run.sh

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+#!/usr/bin/env bash
+
+if ! (which jq >& /dev/null); then
+    echo "ERROR: please install the 'jq' utility"
+    exit 1
+fi
+
+#
+#  POSITIVE tests
+#
+for i in toml-spec-tests/values/*.toml; do
+    fname="$i"
+    ext="${fname##*.}"
+    fname="${fname%.*}"
+    echo -n $fname ' '
+    res='[OK]'
+    if (../toml_json $fname.toml >& $fname.json.out); then
+        jq -S . $fname.json.out > t.json
+	mv t.json $fname.json.out
+	if [ -f $fname.json ]; then
+	    if ! (diff $fname.json $fname.json.out >& /dev/null); then
+	        res='[FAILED]'
+	    else
+		rm -f $fname.json.out
+	    fi
+	else
+	    res='[??]'
+	fi
+    fi
+    echo ... $res
+done
+
+
+#
+#  NEGATIVE tests
+#
+for i in toml-spec-tests/errors/*.toml; do
+    echo -n $i ' '
+    res='[OK]'
+    if (../toml_json $i >& $i.json.out); then
+	res='[FAILED]'
+    fi
+    echo ... $res
+done