UICommon: Make use of fmt where applicable

Continues the migration to using fmt.

Notably, this allows safely converting a map within USBUtils over to
containing string view instances, rather than std::string instances, as
fmt safely handles the formatting of string views.

Source/Core/UICommon/CMakeLists.txt

@@ -35,6 +35,7 @@ PUBLIC
   pugixml
 
 PRIVATE
+  fmt::fmt
   $<$<BOOL:APPLE>:${IOK_LIBRARY}>
 )