[API][WIN] Add show in taskbar API, both method and Window Subfields. Part #251
[API][WIN] Fix the SetShowInTaskbar didn't work well on Windows XP. Part #251
Merge branch 'master' into issue251
[API][GTK] Implement SetShowInTaskbar in GTK. Part #251
Merge pull request #398 from zhchbin/issue251

[WIN][GTK]hide the window from task bar while keeping it shown