2.5 - Start of filebrowser.

- basic drawing of list and thumbnail view (switchable through 'favourits' icon in header)
- selection of files and directories (bookmarks) works with the RMB (right mouse button)
- load operator for files still unstable (no check for correct file type) and incomplete. (WM_operator_free missing)
immediate TODOS:
- fix load file operator
- finish drawing of buttons in header
- drawing of detailed list with all file info.
- finish selection and execute operators (LMB and MMB execute)
later todos:
- parent dir
- keymap for all the shortcuts
- append/link and databrowse
- ...

source/blender/editors/include/UI_interface_icons.h

@@ -58,6 +58,7 @@ void UI_icon_draw_preview(float x, float y, int icon_id, int nocreate);
 
 void UI_icon_draw_aspect(float x, float y, int icon_id, float aspect);
 void UI_icon_draw_aspect_blended(float x, float y, int icon_id, float aspect, int shade);
+void UI_icon_draw_size_blended(float x, float y, int size, int icon_id, int shade);
 void UI_icons_free();
 void UI_icons_free_drawinfo(void *drawinfo);