GetCIcon
GetCIcon Obtain handle to a specified 'cicn' resource
#include <Quickdraw.h> Color QuickDraw
CIconHandle GetCIcon( id );
short id ; resource ID of desired icon
returns CIconHandle leading to the icon's data structure
GetCIcon obtains a CIcon data structure and initializes it from data in the
'cicn' resources for that specific ID.
id is the resource identifier of the desired icon.
Returns: a CIconHandle leading to the icon's bit image. If the
resource ID id can't be found, the return value is NIL.

Notes: Don't call GetCIcon before every call to PlotCIcon -- GetCIcon creates
a new CIcon data structure each time it's called and the overhead will build
up. Also, GetCIcon doesn't dispose of or detach the 'cicn' resource, so they
need to be purgeable.