Imported CRT FFI lib (#7)

* Added php7 library skeleton

* Re-worked Makefile.frag to use paths correctly

* Added gitignore for lib

* clang-format

* Remove symlinked api.h

* Copy api.h into lib/ as part of build

lib/preload.php

@@ -0,0 +1,7 @@
+<?php
+// php.ini
+// ffi.enable=preload
+// opcache.preload=preload.php
+if (function_exists("opcache_compile_file")) {
+    opcache_compile_file(__DIR__ . "/crt.php");
+}