Update 1.1

Changes:

1.0 (2020.03.05)
-Original release!

1.0.1 (2020.03.18)
-.tsx file added

1.1 (2020.05.01)
-Sprite sheet rearranged (1.1 with old arrangement is also included, but if you never used this sprite set before, use the new one. It's only for people who already use this sprite sheet in their project and don't want to rearrange sprites. If future updates happen, only the new sprite sheet will be updated and included.)
-Updated .tsx and .psd files (only for the new sprite sheet.)
-New set of 16x16 and 32x16 slopes added
-Spikes tile added
-4 new ground tiles added
-New water surface tile added
-Lever added, 3 states, animated
-Locked door added, animated
-Separate chests with treasure inside added
-Stone tombstone already covered in ice added
-Cleaned up readme