Port project to Qt6 across generic and Sailfish targets

Bastian Germannrequested to merge
bgermann/piperka-client:qt6 into master
  • migrate Sailfish packaging metadata from Qt5 to Qt6 (qtc6 builder, Qt6Core/Qml/Quick, sailfishsilica-qt6)
  • update spec macros/install steps to qmake6 equivalents
  • switch Harbour reader page from QtWebKit/SilicaWebView to QtWebView
  • add Qt module declarations for harbour build (including webview)
  • make optional android OpenSSL .pri include conditional in generic .pro
  • replace deprecated foreach usage with range-based for loops in C++

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