[TASK] Add tests for nested markdown inline syntax

Author: linawolf

tests/Integration/tests/markdown/emphasis-nested-md/expected/index.html

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+<!-- content start -->
+
+<div class="section" id="markdown-with-emphasis">
+            <h1>Markdown with emphasis</h1>
+
+    <p>If value 1 is given in a field with marker <em>{receiver}</em>, <em><a href="mailto:[email protected]">[email protected]</a></em> should be chosen and if value 2 or something else is given, <em><a href="mailto:[email protected]">[email protected]</a></em> should be chosen.</p>
+
+
+    <p><em>~~<strong>test</strong><code>aaaaa</code> sdaasdsadasdasd~~</em></p>
+
+    </div>
+<!-- content end -->

tests/Integration/tests/markdown/emphasis-nested-md/input/guides.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<guides xmlns="https://www.phpdoc.org/guides"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="https://www.phpdoc.org/guides packages/guides-cli/resources/schema/guides.xsd"
+        input-format="md"
+>
+    <project title="Project Title" version="6.4"/>
+</guides>

tests/Integration/tests/markdown/emphasis-nested-md/input/index.md

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+# Markdown with emphasis
+
+If value 1 is given in a field with marker *{receiver}*, *[email protected]* should be chosen
+and if value 2 or something else is given, *[email protected]* should be chosen.
+
+_~~**test**`aaaaa`
+sdaasdsadasdasd~~_