gtkapplication: Fix incorrect value passed to g_variant_new()

The code expected to format @u, not u.

https://bugzilla.gnome.org/show_bug.cgi?id=728140
Updated German translation
Fixed Russian translation
docs: Fix parameter names for two functions

Don't use two different parameter names.
Updated Indonesian translation
Add a style class to model buttons

This will let us stop using the class name in Adwaita, and will
help with some future additions.
GtkScaleButton: Don't specify a icon size of zero

This only works for scalable icons, but breaks if we fall
back to pngs.
W32: remove the blue "selected" rectangle when activating a checkbutton

https://bugzilla.gnome.org/show_bug.cgi?id=728806
W32: Fix dummy prelight style for check/radio buttons

Use a dummy transparent gradient instead of actual color (which screws up
focus rectangle on prelight), and apply to non-prelight state as well.

https://bugzilla.gnome.org/show_bug.cgi?id=728807
W32: Add a set of "focused" styles to checkmarks

This prevents checkmarks in modelbuttons from being styled as buttons
(apparently, modelbuttons apply "focused" to their children, unlike
normal buttons).

https://bugzilla.gnome.org/show_bug.cgi?id=728808
W32: Add modelbutton styles

According to what i've been told, modelbuttons are supposed to look
flat, like menu items.

This is basically an improved copy of the menuitem styles.

https://bugzilla.gnome.org/show_bug.cgi?id=728810
csd: Fix drag hightlight drawing

When making the entire window a drop target, as file-roller does,
we don't want to draw the drag highlight around the CSD window
decorations.
https://bugzilla.gnome.org/show_bug.cgi?id=728526
gtk-demo: Make sure to clear the timeout when we stop it
DND: go back to a timeout for cancel animation

Using a tick callback does not really make sense here, since we
are not drawing in a window, but moving a toplevel around.
https://bugzilla.gnome.org/show_bug.cgi?id=728183
win32: add more clipboard data checks to avoid crash

It may happen that the received clipboard data is empty, but
if it's of type image/bmp, gtk+ will crash:

gdk_property_change: 00030AD4 GDK_SELECTION image/bmp REPLACE 8*0 bits:
... delayed rendering
gdk_selection_send_notify_for_display: 00030AD4 CLIPBOARD image/bmp
GDK_SELECTION (no-op)
_gdk_win32_selection_convert_to_dib: 1252003C image/bmp

Program received signal SIGSEGV, Segmentation fault.
0x749a9f40 in msvcrt!memmove () from C:\Windows\syswow64\msvcrt.dll

Thread 1 (Thread 2248.0x1b34):
target=0xc07b) at gdkselection-win32.c:1292
at gdkevents-win32.c:3498
wparam=8, lparam=0) at gdkevents-win32.c:232
message=773, wparam=8, lparam=0)
    at gdkevents-win32.c:263
C:\Windows\syswow64\user32.dll
C:\Users\rugoosse\AppData\Local\virt-viewer\bin\libpangocairo-1.0-0.dll
wparam=0, lparam=-1687549457)
    at gdkevents-win32.c:248
C:\Users\rugoosse\AppData\Local\virt-viewer\bin\libpangocairo-1.0-0.dll

https://bugzilla.gnome.org/show_bug.cgi?id=728745
gdk/win32: VK_SNAPSHOT maps to GDK_Print

Also, I am not sure the above VK_PRINT -> GDK_Print mapping is
correct, but it doesn't hurt yet.

https://bugzilla.gnome.org/show_bug.cgi?id=686170
openbsd: properly set len for gtkmountoperation-x11

sysctl(3) is the correct way to get the lenght for len in this case.
Also drop unused headers and change style to match the rest of the file.
GtkWindow: Avoid a critical in F10 handling

The focus widget might be NULL, and we were forgetting to take
that possibility into account in one place.
Fixed crash in GtkLockButton if a button with permission set to NULL is clicked.

https://bugzilla.gnome.org/show_bug.cgi?id=728992