feat: game server config migration (#4262)

* refactor: simplify game directory names in install_config.sh

The commit simplifies the game directory names in the install_config.sh file. It replaces specific game directory names with a generic variable, shortname, to improve code readability and maintainability.

* fix: handle invalid directory paths

The code now checks if the server files or system directory exist before proceeding. If either directory does not exist, an error message is printed and the script exits.

Author: dgibbs64

lgsm/modules/check_system_dir.sh

@@ -7,16 +7,18 @@
 
 moduleselfname="$(basename "$(readlink -f "${BASH_SOURCE[0]}")")"
 
-if [ "${commandname}" != "VALIDATE" ]; then
-	checkdir="${serverfiles}"
-else
-	checkdir="${systemdir}"
+if [ ! -d "${serverfiles}" ]; then
+	fn_print_fail_nl "Cannot access ${serverfiles}: No such directory"
+	if [ -d "${lgsmlogdir}" ]; then
+		fn_script_log_fatal "Cannot access ${serverfiles}: No such directory."
+	fi
+	core_exit.sh
 fi
 
-if [ ! -d "${checkdir}" ]; then
-	fn_print_fail_nl "Cannot access ${checkdir}: No such directory"
+if [ ! -d "${systemdir}" ]; then
+	fn_print_fail_nl "Cannot access ${systemdir}: No such directory"
 	if [ -d "${lgsmlogdir}" ]; then
-		fn_script_log_fatal "Cannot access ${checkdir}: No such directory."
+		fn_script_log_fatal "Cannot access ${systemdir}: No such directory."
 	fi
 	core_exit.sh
 fi