[SB2] Return XSM as raw pointer.
[SB2] Removed unused code from XmlViewSettingsManager.
[SB2] Decoupled settings showing from ViewSettingsManager.
[SB2] Mark as overrides.
[SB2] Use std::make_shared.
[SB2] Added PanelSettingsDialog.
[SB2] QuarkManager::GetXSD().
[SB2] Use PanelSettingsDialog to display panel & quark settings.
[SB2] Added Apply button.
[SB2] Removed per-quark settings buttons from QML.
[SB2] Removed remnants of old-style quark settings from C++ part.
[SB2] Pass quark QIcons to the PanelSettingsDialog.
[SB2] Larger icons.
[SB2] Ported changes to Qt5.