lotsa fixes:

- fixed obstacle collision and death on obstacle spike
- moved player move into separate loop after other collision checks
  are done
- fixed level setup, generation and selection
- added test levels for obstacles

assets/levels/00-deadly-obstacles.lvl

@@ -0,0 +1,17 @@
+Description: test obstacles
+Background: background-lila
+                    
+                    
+                    
+   #######          
+   #  v  #          
+   #     #          
+   #> S <#          
+   #     #          
+   #  ^  #          
+   #######          
+                    
+                    
+                    
+                    
+                    

assets/levels/01-friendly-obstacles.lvl

@@ -0,0 +1,17 @@
+Description: test obstacles
+Background: background-lila
+                    
+                    
+                    
+   #######          
+   #  ^  #          
+   #     #          
+   #< S >#          
+   #     #          
+   #^   v#          
+   #######          
+                    
+                    
+                    
+                    
+