Update Doom launcher to work better with the new launch system. Add some

other launchers for the switch to the new system.

.launch/FreeDoom.game

@@ -144,7 +144,7 @@ translate_text() {
 
 
 custom_game() {
-    mapfile -t customGames < <(find "${0%/*}/TobyCustom/" -type f -iname '*.sh')
+    mapfile -t customGames < <(find "${BASH_SOURCE[0]%/*}/TobyCustom/" -type f -iname '*.sh')
     declare -a customMenu
     for i in "${customGames[@]}" ; do
     customMenu+=("$i")