move IXR XML RPC to composer dependency #1970

This is a monky patched version of kissyfrot/php-ixr until my PR has
been accepted upstream.

Plugins using the XML RPC client may need adjustments.

_test/tests/inc/XmlRpcServer.test.php

@@ -33,13 +33,13 @@ function testDateFormat()
         $pageName = ":wiki:dokuwiki";
         $file = wikiFN($pageName);
         $timestamp = filemtime($file);
-        $ixrModifiedTime = (new DateTime('@' . $timestamp))->format(IXR_Date::XMLRPC_ISO8601);
+        $ixrModifiedTime = (new DateTime('@' . $timestamp))->format(DateTime::ATOM);
 
         $request = <<<EOD
 <?xml version="1.0"?>
    <methodCall>
      <methodName>wiki.getPageInfo</methodName>
-     		<param> 
+     		<param>
 			<value>
 				<string>$pageName</string>
 			</value>
@@ -64,6 +64,6 @@ function testDateFormat()
 EOD;
 
         $this->server->serve($request);
-        $this->assertEquals(trim($expected), trim($this->server->output));
+        $this->assertXmlStringEqualsXmlString(trim($expected), trim($this->server->output));
     }
 }

composer.json

@@ -15,7 +15,8 @@
         "aziraphale/email-address-validator": "^2",
         "marcusschwarz/lesserphp": "^0.5.1",
         "splitbrain/php-cli": "^1.1",
-        "splitbrain/slika": "^1.0"
+        "splitbrain/slika": "^1.0",
+        "kissifrot/php-ixr": "^1.8"
     },
     "config": {
         "platform": {