Merge branch 'feat/plugin-feature' into feature/speed-dial

Adapt the speed dial's ActionRegistry to the collapsed
get_plugin_capability(PluginCapabilityId) overload, and restore the
script success/skipped status message the dialog lost when its
PluginScriptRunner refactor was superseded by ActionRegistry.

tests/slic3rutils/CMakeLists.txt

@@ -3,10 +3,13 @@ add_executable(${_TEST_NAME}_tests
     ${_TEST_NAME}_tests_main.cpp
     test_action_source.cpp
     test_plugin_host_api.cpp
+    test_plugin_capability_config.cpp
+    test_plugin_config.cpp
+    test_plugin_capabilities_in_use.cpp
     test_plugin_install.cpp
     test_plugin_lifecycle.cpp
     test_slicing_pipeline_bindings.cpp
-    test_slicing_pipeline_params.cpp
+    test_slicing_pipeline_config.cpp
     test_plugin_sort.cpp
     test_plugin_cloud_metadata.cpp
     ../fff_print/test_helpers.cpp