convert strings among ansi/unicode(ucs2)/utf-8/TCHARS in vc++ on windows platform, easy to use
AtoA: string -> string
WtoW: wstring -> wstring
TtoT: tstring -> tstring
UtoU: strutf8 -> strutf8
AtoU: string -> strutf8
UtoA: strutf8 -> string
WtoU: wstring -> strutf8
UtoW: strutf8 -> wstring
AtoW: string -> wstring
WtoA: wstring -> string
AtoT: string -> tstring
TtoA: tstring -> string
WtoT: wstring -> tstring
TtoW: tstring -> wstring
UtoT: strutf8 -> tstring
TtoU: tstring -> strutf8