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.

server/core/query_classifier.cc

@@ -654,6 +654,19 @@ char** qc_get_table_names(GWBUF* query, int* tblsize, bool fullnames)
     return names;
 }
 
+void qc_free_table_names(char** names, int tblsize)
+{
+    if (names)
+    {
+        for (int i = 0; i < tblsize; i++)
+        {
+            MXS_FREE(names[i]);
+        }
+
+        MXS_FREE(names);
+    }
+}
+
 char* qc_get_canonical(GWBUF* query)
 {
     QC_TRACE();