Added tool for loading every level in scene test mode

tools/check-levels.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Runs every level in scenetest mode
+
+levels=`ls /usr/local/share/games/colobot/levels | cut -d "." -f 1`
+for level in $levels; do
+	echo $level
+	colobot -runscene $level -scenetest -loglevel warn
+done