1. Linking problem on Windows due to Windows macros via
   <vcl/sysdata.hxx> include
2. Drop the custom MOC target for the old KF5 plugin
3. Correctly handle QT5 build without using QFont
4. ImplJobSetup is in the VL library, not the gen plugin

Change-Id: Iad97b1b9b57a8c356aaa88178aff03d0c14558c7