* Don't call generic layout hints templates anymore, i.e.
TemplateRow becomes Row, etc.
* Added more general layout nesting, using uiLayoutSplit()
and uiLayoutBox() functions, for which the sublayouts
can then be accessed using uiLayoutSub(), to put items
in those sublayouts.
* Some steps to make the layout decisions, like which items
to put in which columns, independent of the width of the
window or the text in the buttons. We want the layout to
be stable under resizes and translations.
* Added an "expand" parameter to uiItemR, used now to expand
enums into a row instead of using a menu.
* Template slots are no longer specified per item, but are
a state now, set with uiTemplateSlot.
* Some renaming of Layout functions for consistency.
* Fix for roundbox in stack template, now is always behind
the other buttons.
* Improved python API for layout:
http://www.pasteall.org/5008/python
* Added the build system code to compile files named
editors/*/*_api.c into the makesrna preprocessing.
The reason to do this is to keep operators and API
close together, but it doesn't fit well with the build
system, especially Makefiles use an ugly hack here.
* Some fixes to pass an RNA AnyType through the API,
this will give a PointerRNA, for use in the interface
code for example.
* Added RNA wrapping of some UI template code as a test.
