Redcore Linux 2401

resync with Gentoo Linux' testing tree as of 21.01.2024; Linux kernel v6.6.13 LTS as default, v6.1 LTS and v5.15 LTS available in repositories, for those who want an older kernel; glibc v2.37, gcc v13.2.0, binutils v2.40, clang/llvm v17.0.6, rust v1.74.1 based toolchain; latest mesa, xorg, xwayland and wayland based graphical stack; PipeWire is now the default sound server implementation, replacing both PulseAudio and JACK, modernising the sound stack; OpenSSL v3 is now default, moving away from the good old OpenSSL v1; FFmpeg v6 is now default, moving away from the good old ffmpeg v4.