Merge branch 'feat/plugin-feature' into feature/plugin-slicing

Brings in the Plugins dialog as-you-type search with fuzzy match highlighting
and clickable column-header sorting (name, version, source, status) — PRs
#14610 and #14611.

tests/slic3rutils/CMakeLists.txt

@@ -5,6 +5,7 @@ add_executable(${_TEST_NAME}_tests
     test_plugin_capability_identifier.cpp
     test_plugin_install.cpp
     test_slicing_pipeline_bindings.cpp
+    test_plugin_sort.cpp
     )
 
 if (MSVC)