pidgin/pidgin

Display the preferences window as a singleton from the application

This is how we handle displaying other dialogs and apparently the preferences
window just got missed. We also make it transient for whatever window is active
which means it won't fill an entire cell in a tiling window manager.

Testing Done:
Opened the preferences dialog in i3 and verified it was no longer a full tile and that everything worked as expected.

Reviewed at https://reviews.imfreedom.org/r/2242/
#include <winver.h>
VS_VERSION_INFO VERSIONINFO
FILEVERSION @PURPLE_MAJOR_VERSION@,@PURPLE_MINOR_VERSION@,@PURPLE_MICRO_VERSION@,0
PRODUCTVERSION @PURPLE_MAJOR_VERSION@,@PURPLE_MINOR_VERSION@,@PURPLE_MICRO_VERSION@,0
FILEFLAGSMASK 0
FILEFLAGS 0
FILEOS VOS__WINDOWS32
FILETYPE VFT_APP
FILESUBTYPE VFT2_UNKNOWN
BEGIN
BLOCK "StringFileInfo"
BEGIN
BLOCK "040904B0"
BEGIN
VALUE "CompanyName", "The Pidgin developer community"
VALUE "FileDescription", "Finch UI library"
VALUE "FileVersion", "@PURPLE_VERSION@"
VALUE "InternalName", "libfinch"
VALUE "LegalCopyright", "Copyright (C) 1998-2014 The Pidgin developer community (See the COPYRIGHT file in the source distribution)."
VALUE "OriginalFilename", "libfinch-@PURPLE_API_VERSION@.dll"
VALUE "ProductName", "Finch"
VALUE "ProductVersion", "@PURPLE_VERSION@"
END
END
BLOCK "VarFileInfo"
BEGIN
VALUE "Translation", 0x409, 1200
END
END