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The CMake configuraation file looks for KF5SaneCore, but the library
name is actually KSaneCore.

This fixes building skanlite.

Lets cmake know about the version and allows to automatically add
new versions to bugzilla.

accept translated and untranslated values

already done in KSaneCore and forwarded

and document SANE API limitations

CCBUG: 445139

CCBUG: 446547

GIT_SILENT

batch mode automatically starts a scan after the previous one
with a configurable time delay.

BUG: 411229

The Pixma network backend behaves badly. polling a value will result in
1 second sleeps for every poll. The problem has been reported, but no
easy/quick fix was available and the bug has been there for multiple
years. Since this destroys the usability of the backend totally, we
simply put the backend on the naughty list and disable the option
polling.

BUG: 429260

also indicate scan startup
cleanup KSaneWidget's own emitted progress values