Removed FileSystemSourceShallow
- added option to open Wox Settings from the tray menu

- added a checkbox option specifying whether to leave the command line open after having run a command like >ping google.com
Feature: Added WindowOpener class, which prevents having duplicate windows of the same type opened at the same time
Added PeHeaderReader class, which is used to check whether an application is CUI. This fixes the issue introduced in e0eb8c8.
Fix python plugin crash issues.
close #65 Hide when app loses focus
Combine FolderLinks and DirectoryIndicator into FileSystemPlugin

cc @aaroncampf
Fix crash on invalid chars in path
Fix crash issue when user clicked cancel in UAC prompt window.