Updated with item inspection and new intro screen

Following changes were made:

* Player may now flip horizontally with middle mouse button (to flip vertically: flip and rotate once)

* Added basic item info dialog. Clicking on the "info button" to activate it will also pause the game.

* Improved intro screen

* Fixed issue when adding food on a rotated skillet would mess up the rendered sprite

* Renamed "water grass" to "sweet grass"

HOTFIX UPDATE:

* Fixed Casie's broken attack animation