[Glgui-dev] callback system changes

[Scott F. <sf...@gl...>]

I've finally set aside some time to rework the callback system.  I added a =
few tasks for myself, just to keep it organized.  Here's what I'm plannin=
g on doing by the end of the weekend (assuming work doesn't surprise me):

+ (done) added a pointer to the calling frame to the callback function for =
easy access.

- combine CUI_Frame::Click and CUI_Frame::CallbackFunc into ::Callback that=
 updates the frame's state and then calls callback functions as necessary

- generalize callback : pass an enum for the type of callback action. (clic=
k, hover, hover_leave, etc). should be able to integrate click and drag f=
unctionality into this instead of the current system.

The only other change I have planned is to write up some sort of connectivi=
ty graph manager for key navigation.  Though I'm not yet entirely sure wh=
ere it will exist; possibly just builtin to the frame.

After that I'll probably work on a simple game or other app that uses to gu=
i to hopefully get a better idea where more work is still needed.

if you have any comments or suggestions, send em in.