Organized modules, added indirection for FFI vs extension loading (#10)

* mv src -> ext, lib -> src to be more in line with PHP module expectations

* Fixed dependency for ffi test

* Fixed path in format-check to C source

* CRT will now try the extension first, then FFI

ext/crt.c

@@ -0,0 +1,73 @@
+
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+#include "php_aws_crt.h"
+
+ZEND_DECLARE_MODULE_GLOBALS(awscrt);
+
+PHP_INI_BEGIN()
+STD_PHP_INI_ENTRY(
+    "awscrt.log_level",
+    "",
+    PHP_INI_ALL,
+    OnUpdateLongGEZero,
+    log_level,
+    zend_awscrt_globals,
+    awscrt_globals)
+PHP_INI_END()
+
+static PHP_MINIT_FUNCTION(awscrt) {
+    REGISTER_INI_ENTRIES();
+    return SUCCESS;
+}
+
+static PHP_MSHUTDOWN_FUNCTION(awscrt) {
+    UNREGISTER_INI_ENTRIES();
+
+    return SUCCESS;
+}
+
+static PHP_GINIT_FUNCTION(awscrt) {
+#if defined(COMPILE_DL_ASTKIT) && defined(ZTS)
+    ZEND_TSRMLS_CACHE_UPDATE();
+#endif
+    awscrt_globals->log_level = 0;
+}
+
+ZEND_BEGIN_ARG_INFO(awscrt_version_arginfo, 0)
+ZEND_END_ARG_INFO()
+
+PHP_FUNCTION(awscrt_version) {
+    static const char *version = "1.0.0-dev";
+    AWS_RETURN_STRING(version);
+}
+/* clang-format off */
+const zend_function_entry awscrt_functions[] = {
+    PHP_FE(awscrt_version, awscrt_version_arginfo)
+    PHP_FE_END
+};
+
+zend_module_entry awscrt_module_entry = {
+    STANDARD_MODULE_HEADER,
+    "awscrt",
+    awscrt_functions, /* functions */
+    PHP_MINIT(awscrt),
+    PHP_MSHUTDOWN(awscrt),
+    NULL, /* RINIT */
+    NULL, /* RSHUTDOWN */
+    NULL, /* MINFO */
+    NO_VERSION_YET,
+    PHP_MODULE_GLOBALS(awscrt),
+    PHP_GINIT(awscrt),
+    NULL, /* GSHUTDOWN */
+    NULL, /* RPOSTSHUTDOWN */
+    STANDARD_MODULE_PROPERTIES_EX};
+
+/* clang-format on */
+
+#ifdef COMPILE_DL_AWSCRT
+ZEND_GET_MODULE(awscrt)
+#endif