Added two exported functions `SetWorkbookPrOptions` and `GetWorkbookPrOptions` to support setting and getting the code name property of the workbook
Re-order fields of the workbook properties group to improve the compatibility
Go Modules dependencies upgrade
Put workbook related operating in new `workbook.go` source code
Library introduction docs block updated
- Unzip shared string table to system temporary file when large inner XML, reduce memory usage about 70%
- Remove unnecessary exported variable `XMLHeader`, we can using `encoding/xml` package's `xml.Header` instead of it
- Using constant instead of inline text for default XML path
- Rename exported option field `WorksheetUnzipMemLimit` to `UnzipXMLSizeLimit`
- Unit test and documentation updated
* Fixed issue #539 Fixed error opening excel file created in encoding different from UTF-8, added logging of possible errors when decoding XML if the function does not provide exit with an error
* Added test for CharsetReader
* Fixed #discussion_r359397878
Discussion: https://github.com/360EntSecGroup-Skylar/excelize/pull/540#discussion_r359397878
* Fixed go fmt
* go mod tidy and removed unused imports
* The code has been refactored