titleShape function
A title-placeholder shape (p:sp with type="title") holding text; text
is inserted as-is, not XML-escaped.
Implementation
String titleShape(String text) =>
'<p:sp><p:nvSpPr><p:cNvPr id="2" name="Title"/><p:cNvSpPr/><p:nvPr><p:ph type="title"/></p:nvPr></p:nvSpPr>'
'<p:txBody><a:p><a:r><a:t>$text</a:t></a:r></a:p></p:txBody></p:sp>';