List all users in the system (fixes #373)

Signed-off-by: AnErrupTion <anerruption@disroot.org>

res/config.ini

@@ -184,6 +184,9 @@ load = true
 # You can also set environment variables in there, they'll persist until logout
 login_cmd = null
 
+# Path for login.defs file (used for listing all local users on the system)
+login_defs_path = /etc/login.defs
+
 # Command executed when logging out
 # If null, no command will be executed
 # Important: the session will already be terminated when this command is executed, so