LeftStr() for UnicodeString type
I'm moving some C++Builder code to BCB2010 and need to replace calls to `LeftStr()` and `RightStr()` with appropriate functions, as there's no `UnicodeString` overload of these.

`AnsiLeftStr()` appears to work, but the name is scaring me...

LeftStr() for UnicodeString type
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I'm moving some C++Builder code to BCB2010 and need to replace calls to `LeftStr()` and `RightStr()` with appropriate functions, as there's no `UnicodeString` overload of these.

`AnsiLeftStr()` appears to work, but the name is scaring me...
