This should update the sctk-adwaita to the latest smithay-client-toolkit and wayland-rs.

--

While I was at it, I've decided to cleanup the implementation given that the math was messy, I'm not saying that it's much better, but at least it's more readable, be aware that I was
touching only the parts related to wayland-rs udpate.

The diff might scare you, but it's mostly due to example change, the diff stat for src is the
following:

 src/buttons.rs | 474 +++++++++++++++++++++++++----------------------------------------
 src/lib.rs     | 983 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------------------------------------------------------------
 src/parts.rs   | 281 +++++++++++++++++++--------------------
 src/pointer.rs | 328 ++++++++++++++-------------------------------
 src/surface.rs | 154 ---------------------
 src/theme.rs   | 126 +++++++++---------
 src/title.rs   |   2 +-
 7 files changed, 894 insertions(+), 1454 deletions(-)

Which removed all the inner mutability, mostly all code duplication, and so on.

I'm not entirely sure what to add to the CHANGELOG though... I know that I've fixed constructor the for the FrameConfig (made it public), not sure if it really matters...