Git Editor, Dunst Appearance, Game Scripts, Session Control No Password, Startup Application Fixes

- Change dunst x-spacing to 0 in Xresources so notifications line up
  with edge of screen
- Change git editor to emacs in gitconfig and environment variable
- Remove git difftool from gitconfig
- Add game launch script to turn off compositor and toggle dnd for notifications
- Add game exit script to toggle dnd for notifications
- Remove pkexec from session.sh since password is not necessary
- Separate apps & system processes in startup.sh
- Start system processes in xinitrc
- Start tray apps after delay in xinitrc to fix issues w/ missing
  icons and scrolling / OSD not working
- Replace some polybar modules with tray applications

.scripts/session.sh

@@ -45,16 +45,16 @@ main() {
             light-locker-command --lock
             ;;
         --sleep)
-            pkexec systemctl suspend
+            systemctl suspend
             ;;
         --reboot)
-            pkexec reboot
+            reboot
             ;;
         --shutdown)
-            pkexec poweroff
+            shutdown now
             ;;
         --hibernate)
-            pkexec systemctl hibernate
+            systemctl hibernate
             ;;
         --restart)
             xmonad --recompile