preferences: Convert to using Set*UIColor.

Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>
Patches 0023-0037 from looncraz, unmodified.

Improve/fix tab view layout as discussed

See http://www.freelists.org/post/haiku-development/Unifying-visuals-of-BTabView-usage

Besides the tab bar going the full width of the window, also some
layouting tweaks to several apps and prefs.

Still missing: the first (and last) tabs in the tab bar should be inset by
B_USE_WINDOW_SPACING so the controls in the tab view line up nicely.
I think I remember stippi wanting to look into it... :)

Fix GCC 5 unused-variable warning.

Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>

Adjust apps to conform to previous layout changes.

The Deskbar and Time preferences were both relying on BCheckBox's
previous unlimited max width to get their containing BBoxes to be the
right size. Adjust the box constraints to make this happen at the level
of the box instead.

Silly style fixes

Add Deskbar clock settings to Time Preferences

* Added a new Clock tab to the Time preflet. Added Clock related
controls there. They all function by communicating with Deskbar.
* Put controls in a BBox controlled by the Show clock checkbox.
This more clearly shows that all the clock settings are dependent
on the show clock setting since it doesn't matter what your clock
settings are if you don't show the clock.
* Make revert work.
* Split clock settings into it's own file and struct.
* Re-add the time zone setting.
* Remove the clock settings from the Deskbar preference window, they
are in Time now.
* Make Locale preferences accepts B_LOCALE_CHANGED message, although
not used.

Fix GCC 5 unused-variable warning.

Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>

Adjust apps to conform to previous layout changes.

The Deskbar and Time preferences were both relying on BCheckBox's
previous unlimited max width to get their containing BBoxes to be the
right size. Adjust the box constraints to make this happen at the level
of the box instead.

Silly style fixes

Add Deskbar clock settings to Time Preferences

* Added a new Clock tab to the Time preflet. Added Clock related
controls there. They all function by communicating with Deskbar.
* Put controls in a BBox controlled by the Show clock checkbox.
This more clearly shows that all the clock settings are dependent
on the show clock setting since it doesn't matter what your clock
settings are if you don't show the clock.
* Make revert work.
* Split clock settings into it's own file and struct.
* Re-add the time zone setting.
* Remove the clock settings from the Deskbar preference window, they
are in Time now.
* Make Locale preferences accepts B_LOCALE_CHANGED message, although
not used.