Mouse inputs

Here's the list of the available mouse buttons for the input config system:

• MOUSE_LEFT
• MOUSE_MIDDLE
• MOUSE_RIGHT
• MOUSE_EXTRA_1
• MOUSE_EXTRA_2
• MOUSE_EXTRA_3
• MOUSE_EXTRA_4
• MOUSE_EXTRA_5
• MOUSE_WHEEL_UP
• MOUSE_WHEEL_DOWN