Sync src with amalgamated versions

Now src contains exactly what's embedded in mongoose.c and .h, nothing more.

Added `tools/amalgam.sh` to aamlgamate both files at once.

There are no functional changes to mongoose.c, .h in this PR, only slight filename changes.

test/test_main.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2014-2018 Cesanta Software Limited
+ * All rights reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the ""License"");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an ""AS IS"" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "common/cs_dbg.h"
+#include "test_main.h"
+#include "test_util.h"
+
+#if defined(_MSC_VER) && _MSC_VER >= 1900
+#include <crtdbg.h>
+
+int __cdecl CrtDbgHook(int nReportType, char *szMsg, int *pnRet) {
+  (void) nReportType;
+  (void) szMsg;
+  (void) pnRet;
+
+  fprintf(stderr, "CRT debug hook: type: %d, msg: %s\n", nReportType, szMsg);
+  /* Return true - Abort,Retry,Ignore dialog will *not* be displayed */
+  return 1;
+}
+#endif
+
+#ifndef __cdecl
+#define __cdecl
+#endif
+
+int g_num_tests = 0;
+int g_num_checks = 0;
+const char *g_argv_0 = NULL;
+
+int __cdecl main(int argc, char *argv[]) {
+  const char *fail_msg;
+  const char *filter = argc > 1 ? argv[1] : "";
+  char *seed_str = getenv("TEST_SEED");
+  double started;
+  int seed = 0;
+
+  if (seed_str != NULL) {
+    seed = atoi(seed_str);
+  } else {
+    seed = (int) time(NULL);
+  }
+  printf("seed: %d\n", seed);
+  srand(seed);
+
+  setvbuf(stdout, NULL, _IONBF, 0);
+  setvbuf(stderr, NULL, _IONBF, 0);
+#if defined(_MSC_VER) && _MSC_VER >= 1900
+  /* NOTE: not available on wine/vc6 */
+  _CrtSetReportHook2(_CRT_RPTHOOK_INSTALL, CrtDbgHook);
+#endif
+
+  g_argv_0 = argv[0];
+
+  tests_setup();
+
+  started = cs_time();
+  fail_msg = tests_run(filter);
+  printf("%s, ran %d tests (%d checks) in %.3lfs\n", fail_msg ? "FAIL" : "PASS",
+         g_num_tests, g_num_checks, cs_time() - started);
+
+  tests_teardown();
+
+  if (fail_msg != NULL) {
+    /* Prevent leak analyzer from running: there will be "leaks" because of
+     * premature return from the test, and in this case we don't care. */
+    _exit(EXIT_FAILURE);
+  }
+  return EXIT_SUCCESS;
+}