Event Handler

Similar to text handler, pull out the disparate array of functions which format information from an event ready for display in the UI and put in a handler class with a test suite.

requires https://github.com/quotient-im/libQuotient/pull/686

autotests/texthandlertest.cpp

@@ -363,6 +363,7 @@ void TextHandlerTest::receiveRichInPlainOut_data()
 
     QTest::newRow("ampersand") << QStringLiteral("a &amp; b") << QStringLiteral("a & b");
     QTest::newRow("quote") << QStringLiteral("&quot;a and b&quot;") << QStringLiteral("\"a and b\"");
+    QTest::newRow("new line") << QStringLiteral("new<br>line") << QStringLiteral("new\nline");
 }
 
 void TextHandlerTest::receiveRichInPlainOut()