feat: load the user's mpv.conf

autotests/CMakeLists.txt

@@ -1,4 +1,9 @@
 ecm_add_test(subtitleparsertest.cpp
     TEST_NAME subtitleparsertest
-    LINK_LIBRARIES qtpotato_subtitles Qt6::Test
+    LINK_LIBRARIES qtpotato_core Qt6::Test
+)
+
+ecm_add_test(mpvuserconfigtest.cpp
+    TEST_NAME mpvuserconfigtest
+    LINK_LIBRARIES qtpotato_core Qt6::Test
 )