wmstartup: Annotate service functions, move more logic to main script

.config/dtfscripts/services/conky.dtf

@@ -17,3 +17,15 @@ function start() {
 	return 0
 }
 
+function start-extra() {
+	for i in {1..100}; do
+		if xprop -name "Conky" > /dev/null 2>&1; then break; fi
+		sleep 0.01
+		if (( $i > 99 )); then
+			svc_log "Conky may spawn behind the current desktop"
+			break
+		fi
+	done
+	return 0
+}
+