Use TextBuilder instead of Text for assignment in loops

[christophstuber]

This pattern of appending to texts in loops is very common in BC, especially for building filters:

var
  BinType: Record "Bin Type";
  BinTypeFilter: Text;
begin
  BinType.SetRange(Pick, true);
  if BinType.FindSet() then
    repeat
      BinTypeFilter += '|' + BinType.Code;
    until BinType.Next() = 0;
end;

However, because the Text type is implemented as System.String by the runtime, each assignment creates a new string in memory, which can lead to very poor performance.

Microsoft mentions this in the official documentation https://learn.microsoft.com/de-de/dynamics365/business-central/dev-itpro/developer/methods-auto/textbuilder/textbuilder-data-type#remarks

var
  BinType: Record "Bin Type";
  BinTypeFilter: TextBuilder;
begin
  BinType.SetRange(Pick, true);
  if BinType.FindSet() then
    repeat
      BinTypeFilter.Append('|' + BinType.Code);
    until BinType.Next() = 0;
end;