+2015-01-27
+ * added looking for editor element descriptions in level set directory
+ (for example, in file "<my-level-folder>/docs/elements/custom_1.txt")
+
+2015-01-25
+ * moved "element properties" button in editor from toolbox to palette
+ * added "zoom level tile size" button in editor to toolbox (currently
+ no function behind it; will be used to zoom level editor playfield)
+ * added key shortcuts '1' to '3' to view properties of drawing elements
+ * fixed gadget display bug in editor (door 1 area) after test playing
+ * fixed bugs when changing drawing area gadgets (like group elements)
+