QtWebkit v. QtWebEngine discussion

Based on the long term deprecation of QTWebkit and migration to QTWebEngine, I asked on the ArchLinux forums why they were still on the former for both KMM and libAlkimia. https://bbs.archlinux.org/viewtopic.php?id=262028 is a link to that discussion. Starting point is that they just follow the upstream default - so do we want to switch the default to QTWebengine? For further discussion, and forum thread asks whether we actually need either, or could use something with less bloat. I open this issue per suggestion on IRC.

QtWebKit/QtWebEngine are currently used by:

• check printing plugin
• reports plugin
• reconciliation report
• home view
• LibAlkimia