Remove Qt 5.9 support
Normally we would only remove features in major versions. In this case we actually have removed the support a while ago by not building the Qt 5.9 docker images. If you try to explicitly build an app for Qt 5.9 with current Clickable, it will download an outdated image and then complain about it being too old. Therefore I'd rather have Clickable state that 5.9 is not supported.
What changes exactly with this:
- If
framework
is explicitly set to one ofubuntu-sdk-16.04
,ubuntu-sdk-16.04.1
, ...,ubuntu-sdk-16.04.4
, Clickable will just build with a recent image (with Qt 5.12) instead of an outdate one (with Qt 5.9) - If
qt_version
is set to5.9
, Clickable will report that this version is unsupported instead of failing as described above.