spa: add topic-based logging

Add a struct spa_log_topic that allows for logical grouping of messages.
The new macros spa_log_logt() and spa_log_logtv() take a topic as
argument, the topic's level acts as filter.
A new macro spa_log_topic_init() initializes a topic. By default a topic
inherits its logger's debug level but a logger implementation may set
that topic to a specific fixed log level.

The various spa_log_*() macros transparently wrap new and old
implementations:
- if the implementation is version 0, the new logt() calls drop the
  topic and get routed into the old log() calls
- if the implementation is version 1, the old log() calls use a NULL
  topic and get routed into the new logt() calls

All spa_log_* macros use the SPA_LOG_DEFAULT_TOPIC topic (NULL), it is
up to the caller to redefine that. Alternatively, use spa_logt_* to pass
an explicit topic.

There is one crucial flaw in this implementation: log topics are
initialized to their target level by the current logger. Where a topic
is initialized but the logger is switched later, the topic is not
automatically re-initialized. Ultimately this shouldn't matter for
real-world use-cases.

spa/include/spa/utils/defs.h

@@ -207,6 +207,7 @@ struct spa_fraction {
 #define SPA_SENTINEL __attribute__((__sentinel__))
 #define SPA_UNUSED __attribute__ ((unused))
 #define SPA_NORETURN __attribute__ ((noreturn))
+#define SPA_WEAK __attribute__ ((weak))
 #else
 #define SPA_PRINTF_FUNC(fmt, arg1)
 #define SPA_FORMAT_ARG_FUNC(arg1)
@@ -216,6 +217,7 @@ struct spa_fraction {
 #define SPA_SENTINEL
 #define SPA_UNUSED
 #define SPA_NORETURN
+/* SPA_WEAK intentionally undef here */
 #endif
 
 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L