Code refactoring and bugfix

[aigazy]

1. Refactored module names in uses sections according to the Embarcadero coding style
2. Separation of module names for FMX and VCL
3. Fixed a bug in the method for adding a new sheet (function TZSheets.Add(title: string): TZSheet): the sheet title and number of sheets were not set, which led to memory leaks:

destructor TZSheets.Destroy();
var i: integer;
begin
  // FCount was not changed, that is why it will not free added sheets
  for i := 0 to FCount - 1 do
    FreeAndNil(FSheets[i]);
  SetLength(FSheets, 0);
  FSheets := nil;
  FStore := nil;
  inherited Destroy();
end;

[MAUROFAILO]

I find ad error in procedure TZCell.SetDataAsInteger(const Value: integer);
The procedure set Data := Trim(IntToStr(Value));
We must user the variable FData and not the variable Data.
I change the procedute in:

procedure TZCell.SetDataAsInteger(const Value: integer);
begin
CellType := ZENumber;
FData := Trim(IntToStr(Value));
if assigned(FRichText) then begin
FRichText.Free();
FRichText := nil;
end;
end;

[mobius1qwe]

While this code will work with newer Delphi versions, gotta remeber that that scoped naming convention only work in XESomething (maybe XE3+) versions beyond, so any Older versions of Delphi won't work with that naming
Don't know if the repository is supposed to serve all Delphi versions but, it's a thing to keep in mind