CI: Update to Debian 10 'buster', drop Debian 8 'jessie', add qhelpgenerator
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CI: Build on Debian 10 'buster' by default
Previously, we built on Debian 9 'stretch' by default, and on Debian 10 'buster' only on request. Let's reverse that so that we get more modern toolchains, before Debian 9 'stretch' reaches EOL.
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CI: Don't build on Debian 8 'jessie'
Debian 8 'jessie' has reached EOL for mainstream security support, which puts it outside our usual distribution/OS support policy.
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CI: Install qhelpgenerator for native production build
This will be used in !150 (merged).