Changes:

/etc/rc.d/rc.M:
- Added entry for dhcpcd
- Added entry for psd

/etc/rc.d/rc.S:
- Removed useless sleep before mounting local filesystems
- Create /run/user

/etc/rc.d/rc.6:
- Added saving alsa sound state if /etc/rc.d/rc.alsa is executable
- Added entry for psd

/etc/rc.d/rc.dhcpcd:
- Just run dhcpcd on boot

/etc/rc.d/rc.alsa:
/etc/rc.d/rc.dnsmasq:
- Just added a newline at the end to differentiate from the original and set the permissions to 755

/etc/rc.d/rc.psd:
- Start the Profile-Sync-Daemon

/etc/profile.d/wheel-path.sh:
- Added sbin paths to the PATH for users in the wheel group

/etc/profile.d/unset-less.sh:
- Removed LESS variable to fix colors in git log

/etc/profile.d/xdg-runtime-dir.sh:
- Create/Set XDG_RUNTIME_DIR properly

/etc/sudoers.d/wheel:
- Allow all users in the wheel group to access sudo

/etc/sysctl.d/swappiness.conf:
- Set healthy swappiness values for desktop workloads

/etc/cron.hourly/psd:
- Resync /etc/rc.d/rc.psd on a hourly basis, if enabled

/etc/cron.weekly/fstrim:
- Trim any available SSDs on a weekly basis

/etc/slackpkg/blacklist:
- List of packages I usually remove from a slackware base install

/etc/dhcpcd.conf:
- Removed nohook for wpa_supplicant, to run it on every wireless interface

/etc/dnsmasq.conf:
- Set listen-address to 127.0.0.1 to open it up only locally

/etc/ntp.conf:
- Uncommented all default NTP servers

/etc/resolv.conf.head:
- Set the default nameserver to 127.0.0.1, where dnsmasq should be running

/etc/wpa_supplicant.conf:
- Set ctrl_interface_group to netdev, to allow non-root users to connect to the daemon
- Allow the config to be updated by the daemon

/etc/X11/xinit/xinitrc.i3:
- Added xinitrc file for the i3 window system

/etc/X11/xorg.conf.d/50-synaptics.conf:
- Set up my preferred mousepad settings

/usr/share/vim/vimrc:
- Don't create backup or undo files

/usr/libexec/slackpkg/functions.d/post-functions.sh:
- Adapted the looknew() algorithm to find all the .new files