Mouse input is now feature complete

Mouse input is now fully implemented, featuring

• Support for Left, right, and middle mouse buttons each withdown, up, pressed, and released states
• Mouse wheel
• Current position and delta position since the previous frame
• Option to grab the mouse cursor and keep it inside of the game window
• Option show or hide the mouse cursor
• Replacing the cursor with a custom sprite is demonstrated in examples/input_mouse

See demo:

The updated mouse input API is as follows:

# Mouse input API

Mouse.position # Current mouse cursor position (x & y)
Mouse.delta_position # Delta position since the previous frame

Mouse.cursor.show! # Show the mouse cursor
Mouse.cursor.hide! # Hide the mouse cursor

Mouse.cursor.grab! # Force the cursor to stay inside the game window
Mouse.cursor.release! # Allow the cursor to move outside of the window

Mouse.wheel # (x, y)
Mouse.buttons.[left|right|middle].[down?|up?|pressed?|released?]