[fpc-pascal] Set of encoding conversion routines

[theo]

> I just needed UTF-8 to Latin 1 ISO but I can't find a cross-platform
> solution. Remembering that UTF8ToAnsi doesn't solve the problem
> because it converts to the system encoding and not Latin 1 ISO.
>
>   

A simpe option might be:

wides:=UTF8Decode(utf8s);
widestringmanager.Wide2AnsiMoveProc:=@defaultWide2AnsiMove;
ansis:=wides;


Maybe set back widestringmanager.Wide2AnsiMoveProc to the original proc 
after that.