Doc: a workaround to fix missing snippets in the QMake Manual
Doc: a workaround to fix missing snippets in the QMake Manual

Replaced snippets with code inside \code. The snippets can come
back after the manual is modularized, therefore the \omits.
Snippet paths will have to be fixed, though.

Change-Id: Ibec265773b186c1c5be676722db99f60a20d18d3
Reviewed-by: Joerg Bornemann <47777b9406dbddd02a3fdca8341789a013805a11@digia.com>

kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc