Path code cleanup, move some UI code (#21037)

* Move a bunch of path logic into Core/Util/PathUtil.cpp/h

.

* Move GameImageView out from SaveDataScreen

* More cleanup, add a translation string

libretro/Makefile.common

@@ -887,6 +887,7 @@ SOURCES_CXX += \
 	       $(COREDIR)/Util/PPGeDraw.cpp \
 	       $(COREDIR)/Util/RecentFiles.cpp \
 	       $(COREDIR)/Util/AudioFormat.cpp \
+	       $(COREDIR)/Util/PathUtil.cpp \
 	       $(COREDIR)/Util/PortManager.cpp \
 	       $(CORE_DIR)/UI/GameInfoCache.cpp