MXS-701: Improve binlogfilter

Added `match` and `exclude` functionality. This allows versatile filtering
without a large investment of development time by leveraging the benefits
of PCRE2 regular expressions.

Also cleaned up the filter and removed the single table matching and
active parameter that were obsoleted by the regular expression parameters.

include/maxscale/query_classifier.h

@@ -761,6 +761,13 @@ qc_sql_mode_t qc_get_sql_mode();
  */
 char** qc_get_table_names(GWBUF* stmt, int* size, bool fullnames);
 
+/**
+ * Free tables returned by qc_get_table_names
+ *
+ * @param names List of names
+ * @param size  Size of @c names
+ */
+void qc_free_table_names(char** names, int size);
 
 /**
  * Returns a bitmask specifying the type(s) of the statement. The result