v0.1.3 updates

Bug fixes:

• No more double undo when undoing during a jump
• Fixed bugs related to creating cubes overlapping the player
• Other minor fixes

Small features:

• Autojump/edge protection is simplified and now connected to the player using shift and caps lock
• Updated the appearance of the creation and destruction "guns"
• Updated then way it's communicated when the player has obtained a yin yang (both in level and from the level select screen)
• Redid the tutorial be in a square configuration instead of a line
• Custom sounds for pickup, creation, destruction, celebration, etc. using simple piano
• Access menu using ESC (previously avoided it for development reasons)