Use a faster deepcopy library

[Juneezee]

Description

We currently use the deepcopy function from https://github.com/mohae/deepcopy to duplicate columns, rows, and worksheets, as shown in the following references:

excelize/col.go

Line 536 in 5f446f2

c := deepcopy.Copy(col).(xlsxCol)

excelize/col.go

Line 554 in 5f446f2

c := deepcopy.Copy(column).(xlsxCol)

excelize/rows.go

Line 656 in 5f446f2

rowCopy = deepcopy.Copy(ws.SheetData.Row[i]).(xlsxRow)

excelize/rows.go

Line 732 in 5f446f2

cfCopy := deepcopy.Copy(*cf).(xlsxConditionalFormatting)

excelize/rows.go

Line 762 in 5f446f2

dvCopy := deepcopy.Copy(*dv).(xlsxDataValidation)

excelize/sheet.go

Line 127 in 5f446f2

column := deepcopy.Copy(ws.Cols.Col[left]).(xlsxCol)

excelize/sheet.go

Line 753 in 5f446f2

worksheet := deepcopy.Copy(sheet).(*xlsxWorksheet)

The https://github.com/mohae/deepcopy library has not been updated in 7 years (last commit was September 2017). We should opt for a newer deep copy library.

I suggest we switch to https://github.com/tiendc/go-deepcopy. The benchmarks indicate that it is faster than other popular deep copy libraries.

[xuri]

Thanks for your suggestion. Would you like to create a PR for this?

[Juneezee]

Thanks for your suggestion. Would you like to create a PR for this?

@xuri Sure! 😊