Adding bindings. Arguments added to initialize & with-init.

[togekawa5]

1. Adding bindings
   set-window-attribute
   set-monitor-user-pointer
   get-monitor-user-pointer
   set-window-icon
   get-window-frame-size
   maximize-window
   focus-window
   request-window-attention
   set-window-maximize-callback
   set-window-content-scale-callback
   wait-events-timeout
   raw-mouse-motion-supported-p
   get-key-name
   get-key-scancode
   create-cursor
   create-standard-cursor
   destroy-cursor
   set-cursor
   set-char-mods-callback
   set-drop-callback
   get-joystick-hats
   get-joystick-guid
   set-joystick-user-pointer
   get-joystick-user-pointer
   joystick-is-gamepad-p
   set-joystick-callback
   update-gamepad-mappings
   get-gamepad-name
   get-gamepad-state
   get-timer-value
   get-timer-frequency
   *-userpointer are not exported from cl-glfw3.
2. Initialize gets arguments
   (initialize)->(initialize &key atts...)
   (with-init &body body)->(with-init (&rest keys...) &body body)
   In this PR, with-init-window's argument didn't change because of complexity of adding init-hint, such as whether (w-i-w init-hints window-hints body) or (w-i-w window-hints init-hints body) is better when adding init-hints, etc.
3. Additional example
   icons-test is added cl-glfw3-examples. it uses images.
4. Renaming work-area->workarea
   get-monitor-work-area is renamed get-monitor-work-area. I matched with binding-name rules. Now get-monitor-work-area calls get-monitor-workarea and warns not recommended.

[togekawa5]

I tested create-cursor, set-cursor on windows sbcl and there is no problem, but when tested on ubuntu sbcl the colors may not display properly. For example, *colocr-check*cursor shows all colors correctly, but *yellow* and *blue* created in the same way show different colors than intended.
set-window-icon handles image-structure as well, but it worked fine on both windows and ubuntu.