base: s/addkv_{bool,number,object}/setkv

Now heim_audit_addkv() correctly supports multiple values, the other functions
that (by design) replace existing values with a single value should use the
heim_audit_setkv prefix.

A subsequent commit could add variants that support multiple values for
non-string types.

lib/base/version-script.map

@@ -29,10 +29,10 @@ HEIMDAL_BASE_1.0 {
 		heim_array_iterate_reverse_f;
 		heim_array_set_value;
 		heim_audit_addkv;
-		heim_audit_addkv_bool;
-		heim_audit_addkv_number;
-		heim_audit_addkv_object;
 		heim_audit_addkv_timediff;
+		heim_audit_setkv_bool;
+		heim_audit_setkv_number;
+		heim_audit_setkv_object;
 		heim_audit_addreason;
 		heim_audit_getkv;
 		heim_audit_trail;