logging: add LogPrintfCategory to log unconditionally with category

prefixing the output with the passed category name.

- add documentation
- add a unit test
- update lint-logs.py
- update lint-format-strings.py

src/logging.h

@@ -199,13 +199,18 @@ static inline void LogPrintf_(const std::string& logging_function, const std::st
     }
 }
 
-
 #define LogPrintLevel_(category, level, ...) LogPrintf_(__func__, __FILE__, __LINE__, category, level, __VA_ARGS__)
 
+// Log unconditionally.
 #define LogPrintf(...) LogPrintLevel_(BCLog::LogFlags::NONE, BCLog::Level::None, __VA_ARGS__)
 
+// Log unconditionally, prefixing the output with the passed category name.
+#define LogPrintfCategory(category, ...) LogPrintLevel_(category, BCLog::Level::None, __VA_ARGS__)
+
 // Use a macro instead of a function for conditional logging to prevent
 // evaluating arguments when logging for the category is not enabled.
+
+// Log conditionally, prefixing the output with the passed category name.
 #define LogPrint(category, ...)                                        \
     do {                                                               \
         if (LogAcceptCategory((category), BCLog::Level::Debug)) {      \
@@ -213,6 +218,7 @@ static inline void LogPrintf_(const std::string& logging_function, const std::st
         }                                                              \
     } while (0)
 
+// Log conditionally, prefixing the output with the passed category name and severity level.
 #define LogPrintLevel(category, level, ...)               \
     do {                                                  \
         if (LogAcceptCategory((category), (level))) {     \