QtCreator autocompletion and syntax highlighting for qmlproject files

As we are expanding the APIs for qmlproject files, make sure that QtCreator autocompletion as we well as syntax highlighting is up-to-date.

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Reference document for the (MCUs) QmlProject API:

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• https://intranet.qt.io/pages/viewpage.action?spaceKey=QOM&title=QmlProject+API+1.3
• https://doc.qt.io/QtForMCUs-2.3/qtul-qmlproject-reference.html

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Acceptance criteria:

• All QUL qmlproject APIs are correctly color-highlighted in Qt Creator code editor
• All QUL qmlprojectAPIs can be auto-completed in Qt Creator code editor

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