Add PHP wrapper, use header for right platform for PHP & Swift, simplify Swift Windows fix

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+# PHP Wrapper
+
+## Requirements
+
+You will need to install [PHP](https://www.php.net/downloads) 7.4 or later. For testing, you can use dependency
+manager [Composer](https://getcomposer.org/doc/00-intro.md) to download PHPUnit.
+
+Activate the [FFI](https://www.php.net/manual/en/ffi.setup.php) extension (Composer will also warn if you do not have it
+enabled).
+
+## Test etc.
+
+Test (also installs PHPUnit using Composer and builds shared Go library for current platform):
+
+```shell
+make test
+```
+
+Only build shared library and copy modified C header for the current platform to the right directory:
+
+```shell
+make install-header
+```
+
+Or for the specified platform:
+
+```shell
+make install-header GOOS=windows GOARCH=amd64
+```