Roadmap for release 0.8

[JanMarvin]

This will be release 0.8 and should be the eleventh released to CRAN.

Maybe the last prior to 1.0. But, there have been many changes already and I want to have things tested a bit prior to the 1.0 release. I'm planning with a release at the end of the month.

open pull requests to merge

• Stop advertising functions that don't fit in openxlsx2 API #694

open pull requests to modify

• N/A

issues to work on pre release

• Thoughts / observations about arguments / fn name consistency. #681
• provide a file creation date for wrapper tests #685