Version 0.3

Release 0.3

* Adds frog sprites and animations
* Adds a trash can toggle to delete tools placed
* Adds 3 new tutorial levels
* Adds Main Menu
* Adds Snake Enemy
* Fixes bug where placement cursor could be seen through UI
* Fixes and clarifies where player can and can't place tools
* Fixes bug where amount of frogs in level would change if some frogs died and player restarted level
* Replaces wall sprite