Add logs to the bug report dialog

Remove the compiler label; it's not filled in. And add a text
edit field with the combined sysinfo, log and crash log files,
and place the contents on the clipboard for easy pasting.

It's a pity we cannot use the bugzilla REST api to automatically
add these files as an attachment.

From now on, we can simply ask people to report bugs using the
dialog and add this information.

CCMAIL:kimageshop@kde.org