Sheet titles containing " " or "!" will be quoted in formulas. This commit
fixes the lookup of sheets with this kind of title by trimming the quotes
during the lookup.
Without this any defined range referencing a sheet with " " or "!" in the title
name will be lost when reading the workbook from file.
Fixes#928
Closes 930
When extracting sheet title from string reference (like `"Work!sheet1!A1"`), PHP function `explode()` divide this string into three parts: `['Work', 'sheet1', 'A1']`. And then these wrong values are used in formulas, ranges, etc.
This change fix that problem by using special function `Worksheet::extractSheetTitle()`. This function also has been changed to make sure that worksheet title can contain "!" character. So, that function search last position of "!" in reference string and divide it to 2 parts correctly: `['Work!sheet1', 'A1']`.
Fixes#325Fixes#662
Fixes a bug when calling `$sheet->freezePane('B2')` without a second argument.
The selected cell will now be `B2` instead of the incorrect `B3`.
Fixes#389Closes#393
