UI: Panels

* API and usage is basically the same still.
* Panels were moved to region level. I first thought of keeping them at area
  level, but having them at region level it's simpler to handle events and do
  drawing, and also to integrate with view2d. They can still become area level
  overlapping regions, if we make a floating (or docked) region that can
  contain panels.
* Added back a few panels from the scene buttons for testing.

Issues still:
* The view2d handling and alignment refresh of panels is not correct yet in the
  buttons window. 
* I did not yet bring back the block handlers system. It was basically a system
  that stored which panel was open and where the events for that panel would go.
  Just a few functions, but not sure how it fits in 2.5.
* There was a case where dragging panels would not properly remove the window
  level handler, but could not redo anymore even though I don't think I fixed
  it.
* Some text in the panels goes past the end of the button, that is due to the
  checkmark button drawing, not related to this commit.

Other UI code changes:
* Renamed interface.h to interface_intern.h for consistency.
* Fixed some issues with freeing of blocks when they changed due to context.
* uiDrawBlock now takes a context pointer (mostly for block drawextra).

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/editors/interface/interface_icons.c b/source/blender/editors/interface/interface_icons.c
index 5e0c78ebf35..22496513796 100644
--- a/source/blender/editors/interface/interface_icons.c
+++ b/source/blender/editors/interface/interface_icons.c
@@ -61,7 +61,7 @@
 // XXX #include "BIF_screen.h"
 
 #include "UI_resources.h" /* elubie: should be removed once the enum for the ICONS is in BIF_preview_icons.h */
-#include "interface.h"
+#include "interface_intern.h"
 #include "ED_datafiles.h"
 
 #define ICON_IMAGE_W		512