Sonar cleanup 20 - #9048

Resolve some sonar issues , clean up more items

• Define <=> op for EiScreen::HotKeyItem
• Remove unnneed semi-colons (mostly after namespace brackets)
• ArchNetworkBsd: Set add to nullptr when cleaning up previous address returning the pointer value.
• Use QString::first(n) in place of QString::mid(0, n)
• Remove unused method parameter names from overloaded methods in sub classes.
• set (and use) CPACK_PROJECT_HOMEPAGE_URL
• update the pkgbuild to be more like deskflow-git's
• use Settings::settingsFile() in place of instance()->m_settingsFile