Address review comments

* Convert %x to {:x}
* Convert {0:#010x} to {:#010x}
* Remove `? true : false` statement
* Remove `.c_str()` for strings

src/common/string_util.cpp

@@ -189,7 +189,7 @@ bool TryParse(const std::string& str, bool* const output) {
 }
 
 std::string StringFromBool(bool value) {
-    return value ? "True" : "False";
+    return value;
 }
 
 bool SplitPath(const std::string& full_path, std::string* _pPath, std::string* _pFilename,