don't include company name on More Details buttons (sometimes doesn't…

… fit)

fix html template renderer test after changes

refactor screenshot/bitmap handling to immediately dispose when done

minor updates to readme and xml comments for release

remove warning.ico project icon to avoid compile errors in the new nu…

…get PackageReference format - issue PandaWood#19

update nuget release description ready for 2.3.0

final refactor and all attachment cases tested, SMTP good

update readme for recent enhancement with file attachments