Fix HTML Layout. Support multiple formats at once. More handling. This commit is a bad mix of multiple changes. It addresses: - HTML Width is now relative and should fix some pdf creation problems. - Format is now taken from the extension of the file names provided. - Multiple file names are accepted at once. - Parser now handles missing values in Multiple choice answers - Parser now handles unfilled multiple choice values

<!DOCTYPE RCC><RCC version="1.0">
<qresource prefix="/l10n">
    <file alias="main_de_DE.qm">@CMAKE_CURRENT_BINARY_DIR@/main_de_DE.qm</file>
</qresource>
</RCC>