Reworked borders (#1261)

* Added ONLYOFFICE as an option

Though, xlsx$open() cannot be invoked, see: https://forum.onlyoffice.com/t/invoking-opening-an-xlsx-file-from-tmp-folder-does-not-succeed/11339

* Restructured add_border

It might bring some performance to this function to reduce the calls to create_border, determining style names and dimensions.

* ONLYOFFICE does not work :(

* [borders] fix lintr and a copy & paste mistake

* Added ONLYOFFICE support

When using ONLYOFFICE installed via snap please set TMPDIR to other locations within your .Renviron than /tmp since snap packages seem to be unable to access /tmp if you want to use wb$open(). Make sure to restart R/RStudio after making changes to .Renviron!

* [misc] fix lintr

* [misc] update NEWS, AUTHORS and WORDLIST

NEWS.md

@@ -4,7 +4,7 @@
 
 * It is now possible to create shapes using `create_shape()`. [1231](https://github.com/JanMarvin/openxlsx2/pull/1231)
 * Various input checks were added to the style helpers
-* `write_xlsx()` now accepts `wb_set_base_font()` arguments to set the base font (size, color, name) for the entire workbook. [1262](https://github.com/JanMarvin/openxlsx2/pull/1262)
+* `write_xlsx()` now accepts `wb_set_base_font()` arguments to set the base font (size, color, name) for the entire workbook. ([1262](https://github.com/JanMarvin/openxlsx2/pull/1262), @uhkeller)
 
 ## Fixes
 
@@ -18,6 +18,7 @@
 * Update of internal pugixml library
 * Switch to `f_attr` to handle more formula attributes
 * Remove the use of `cc_out` when writing output files
+* Refactoring of `wb_add_border()` (@pteridin)
 
 ## Breaking changes