Make wrap 'true' by default for both GoToDesktop and SendToDesktop,
in order to default to the current behaviour, and to stay consistent
with Openbox behaviour.
- Minimize includes in `ssd.h`
- Avoid repetitive `view->ssd.margin` pattern
- Use `struct ssd *` or `const struct ssd *` rather than `struct view *`
where convenient
Part of the motivation is to make it easier to separate `struct ssd`
from `struct view` in a future commit.
IMHO it encourages better design (by making dependencies more obvious)
to have source file/header file pairs like view.c/view.h, rather than a
monolithic header like labwc.h with everything in it.
I don't think we need to break up all of labwc.h at once, but maybe we
can start pulling it apart bit by bit as it's convenient.
Also:
- Move "struct border" to ssd.h so that view.h can use it without pulling
in all of labwc.h.
- Add a missing required #include within scaled_font_buffer.h (forward
declaration of "struct font" is not enough).
Actions GoToDesktop and SendToDesktop now support the new direction
called "last" that corresponds to the last used workspace (see Openbox
help[1] for reference).
[1]: http://openbox.org/wiki/Help:Actions#GoToDesktop
