Update documentation
Refactor Cell::Number ==> Cell::Numeric
Add inline string read/write support
Add basic formula read support
For string type cell, Cell::value() return the string instead of the index
Code refactor for Worksheet::writeHyperlink()
Add read support for workbookView properties
Pass const QString by reference instead of by value
Add a private sheetId() member for Worksheet
Add read support for error cell type
tst_worksheet: using cellAt() instead of private member
Add unit test for QXlsx::Document
Add QDateTime support for QXlsx::Cell
Fix Styles::readNumFmts() bug
Example: Remove wrongly added statements