[gtk+] (21 commits) ...Add gtk_symbolic_color_new_win32 to gtk.symbols

[Alexander Larsson <alexl src gnome org>]

Summary of changes:

  e953465... Save a generic boxes source in GtkImageBorder (*)
  c09148c... Add GtkStylePropertyContext and use it in when getting styl (*)
  7104b4b... Remove _gtk_style_properties_peek_property (*)
  2cf3ff9... Actually pass in a StylePropertyContext when getting images (*)
  8b644b4... make _gtk_style_property_resolve copy the result to an outp (*)
  abe6598... Add initial cut at win32 theme support for CSS (*)
  bc38cf1... win32-theme: Support -gtk-win32-size CSS value (*)
  5e04549... Render background image if set for checks and options (*)
  fdbf029... win32-theme: Support multiple parts being combined (*)
  a038c58... Add top/left/bottom/right style classes to steppers (*)
  68c74e1... Set top/bottom style classes on spinbutton buttons (*)
  ca829b4... Add pulse style class and use in progress bar and entry (*)
  3309639... Add support for win32 theme colors as symbolic colors (*)
  5f782d2... win32-theme: Support mixing parts (*)
  e9ac608... win32-theme: Add gtk-win32.css (*)
  a38c48b... Build gtkwin32css.h from gtk-win32.css (*)
  f59836a... Build in default win32 css as gtk-win32 (*)
  88d059f... win32: Default to gtk-win32 theme (*)
  4bfa354... Merge branch 'win32-theme2'
  07e284a... win32-theme: Fix up docs for gtk_symbolic_color_new_win32
  c6dab00... Add gtk_symbolic_color_new_win32 to gtk.symbols

(*) This commit already existed in another branch; no separate mail sent