Added in changeset 1352.
Moved the color definitions for the icon colors to gui_draw.h and updated the code accordingly.
Currently this is compiled conditionally and only enabled for G10, G12, SX30 and IXUS310.
Other cameras will use the old icons.
Add a define for CAM_USE_COLORED_ICONS in platform_camera.h to enable.
Will probably require tweaking the icon color definitions in gui_draw.h for each camera.