Log Message:
geogrpahy/merkaator: Update to 0.20.0

packaging changes:
  - switch to cmake, because upstream dropped qmake
  - complete rototill of dependencies
  - WalkingPapers plugin is gone, and seems rolled into base not plugin
    (if you use it, please feel to test and send me fixes if needed)

upstream NEWS:

v0.20.0
    * ADD: Implemented OAuth2 authentication.
    * ADD: AppImage builds.
    * FIX: Fixed CI builds.
    * FIX: libproxy and libgps external library handling by build system.
    * FIX: CMake unity builds.
    * FIX: Windows localization.
    * DEL: Removed some dead code, qmake build config.