3.0.0 pre-release 002

Addresses:

#13 - Direct gamepad access functions have been added in case people want to use the SDL implementation without the Player and Verb interfaces

#16 - Added input_cursor_follow_camera() a very simple "relative to camera" function

#17 - Added input_check_press_most_recent() to find the most recently activated verb from an array (or all player verbs if all is used)

#18 - All checker functions can now take an array of verbs