PorteuX 2.4

This release brings the COSMIC desktop environment for 'current'. Bear in mind it's still in beta, so expect many issues, including cosmic-osd running at full CPU load (already reported). This is the last PorteuX release that will include a version based on Slackware stable. After much consideration, we decided that this version is just too old and brings no advantage over the current version, which is extensively tested before each PorteuX release. Changes: fixed date/time during boot time; fixed cheatcode from using UUID not having a trailing slash; fixed Cinnamon rendering in Wayland; fixed cropped title bar in Xfce; fixed small title bar icons in Openbox....