Add slight border to the left of AttentionBar icon
Slightly better "Welcome to Poedit" font on Windows
Fix broken list control status icons

Give up on generating the icons dynamically and merging several status.
This never worked well, the icons were ugly or hard to read.  Since at
least 1.5, the icons were completely broken on e.g.  OS X and the
bookmarks were very small and unreadable (yet nobody complained -
something tells me the bookmarks aren't used all that much).

Instead, show only a single status icon at a time.  Prioritize the icons
to show the most important status first if there are several conflicting
ones.  Don't number the bookmarks, show the same bookmark icon for all
of them.
Reorganize artwork files

Don't have two toplevel directories for artwork files, 'artwork' and
'icons', put it all into a single place.  Organize the files by
platform, to make them easier to work with.
Add AttentionMessage::Question for completeness
Improve AttentionBar appearance

Don't show icon on GTK+ (consistent with GtkInfoBar).  Don't use
gradient on OS X, prefer a bright solid color.  Make it slightly larger.
Add optional explanation string to AttentionMessage
Don't use gradients on welcome screen

Similarly to 2395c2d4, remove gradients on OS X too, to have a slightly
flatter, more modern look.
Make welcome screen buttons look better on OS X

The look is now much improved compared to the old one.  Added subtle
borders, internal padding, changed fonts to emphasize the title more and
make both the title and the explanation easier to read.
Fix crash when resizing with no splitters shown
Fix sidebar display of gray text after multisel

Due to a bug in wxStaticText's OSX implementation, the text of gray
labels would become black after doing multiple selection (and thus
disabling sidebar).
Fix order of loading gettext catalogs

Load the "poedit" catalog as the last one, because it should take
priority over wxstd translations.
Remove executable bit from boost.bkl
Import Boost 1.56.0.
Merge branch 'vendor/boost'

Conflicts:
	deps/boost/boost/config/compiler/clang.hpp
	deps/boost/boost/uuid/uuid_io.hpp
Don't use 'register' in boost's uuid_x86.hpp

Fix clang warning: 'register' storage class specifier is deprecated
Handle language codes with UN region code properly

Instead of disallowing such locales completely in the list of languages
(as 90aed6cd did), allow them in the list and properly validate them in
the regex. Apparenly, es_419 in particular is commonly used with
gettext, so this is the right thing to do.
Fix crowdin PO names mapping

Some translation (pt, zh_CN) were accidentally not updated due to the
use of %two_letters_code%, which could overlap for multiple
translations.  use %locale_with_understore% instead, with custom mapping
to loose the country part where it makes no sense.  Crowdin sure doesn't
make doing the right thing easy...
Deduplicate OS X installed .lproj files

Due to various bugs in scripts, some of the lproj directories were
created in multiple variants for some languages (e.g.  zh_Hans and
zh-Hans, pt and pt_PT).  Clean this up, make sure there's only one lproj
per language.  Change copy-translations.sh to use the correct form of _
instead of - as the separator.
Update translations from Crowdin