[libcalamares] Move non-UI stuff from libcalamaresui

- Settings is just a settings class, no UI involved, so
   move to libcalamares where it can be used also from
   system helpers.
 - YAML utilities are useful at a lower level of the stack, too.

src/libcalamares/CMakeLists.txt

@@ -18,6 +18,7 @@ set( libSources
     Job.cpp
     JobQueue.cpp
     ProcessJob.cpp
+    Settings.cpp
 )
 set( utilsSources
     utils/CalamaresUtils.cpp
@@ -26,6 +27,7 @@ set( utilsSources
     utils/Logger.cpp
     utils/PluginFactory.cpp
     utils/Retranslator.cpp
+    utils/YamlUtils.cpp
 )
 set( kdsagSources
     kdsingleapplicationguard/kdsingleapplicationguard.cpp
@@ -88,8 +90,11 @@ set_target_properties( calamares
 )
 
 target_link_libraries( calamares
-    LINK_PRIVATE ${OPTIONAL_PRIVATE_LIBRARIES}
+    LINK_PRIVATE
-    LINK_PUBLIC Qt5::Core
+        ${OPTIONAL_PRIVATE_LIBRARIES}
+    LINK_PUBLIC
+        ${YAMLCPP_LIBRARY}
+        Qt5::Core
 )
 
 install( TARGETS calamares

src/libcalamaresui/CMakeLists.txt

@@ -10,7 +10,6 @@ set( calamaresui_SOURCES
     utils/CalamaresUtilsGui.cpp
     utils/DebugWindow.cpp
     utils/ImageRegistry.cpp
-    utils/YamlUtils.cpp
 
     utils/qjsonmodel.cpp
     utils/qjsonitem.cpp
@@ -25,7 +24,6 @@ set( calamaresui_SOURCES
 
     ExecutionViewStep.cpp
     Branding.cpp
-    Settings.cpp
     ViewManager.cpp
 )
 
@@ -71,7 +69,6 @@ calamares_add_library( calamaresui
     UI ${calamaresui_UI}
     EXPORT_MACRO UIDLLEXPORT_PRO
     LINK_PRIVATE_LIBRARIES
-        ${YAMLCPP_LIBRARY}
         ${OPTIONAL_PRIVATE_LIBRARIES}
     LINK_LIBRARIES
         Qt5::Svg