implement game configuration file

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

third-party/tomlc99/unittest/Makefile

@@ -0,0 +1,11 @@
+CFLAGS = -g -I..
+
+TESTS = t1 
+
+all: $(TESTS)
+
+t1: t1.c ../toml.c
+
+clean:
+	rm -f $(TESTS)
+

third-party/tomlc99/unittest/t1.c

@@ -0,0 +1,73 @@
+#include "../toml.h"
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, const char *argv[]) {
+  char xxbuf[6], buf[6];
+  int64_t xxcode, code;
+  int xxsize;
+
+  xxsize = 2, xxcode = 0x80;
+  memcpy(xxbuf, "\xc2\x80", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 2, xxcode = 0x7ff;
+  memcpy(xxbuf, "\xdf\xbf", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 3, xxcode = 0x800;
+  memcpy(xxbuf, "\xe0\xa0\x80", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 3, xxcode = 0xfffd;
+  memcpy(xxbuf, "\xef\xbf\xbd", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 4, xxcode = 0x10000;
+  memcpy(xxbuf, "\xf0\x90\x80\x80", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 4, xxcode = 0x1fffff;
+  memcpy(xxbuf, "\xf7\xbf\xbf\xbf", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 5, xxcode = 0x200000;
+  memcpy(xxbuf, "\xf8\x88\x80\x80\x80", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 5, xxcode = 0x3ffffff;
+  memcpy(xxbuf, "\xfb\xbf\xbf\xbf\xbf", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 6, xxcode = 0x4000000;
+  memcpy(xxbuf, "\xfc\x84\x80\x80\x80\x80", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  xxsize = 6, xxcode = 0x7fffffff;
+  memcpy(xxbuf, "\xfd\xbf\xbf\xbf\xbf\xbf", xxsize);
+  assert(toml_ucs_to_utf8(xxcode, buf) == xxsize &&
+         0 == memcmp(buf, xxbuf, xxsize));
+  assert(toml_utf8_to_ucs(buf, xxsize, &code) == xxsize && code == xxcode);
+
+  return 0;
+}