adds AXI4 pin level test and moves all tests to automatic discovery

tests/io-redirector/test.cpp

@@ -0,0 +1,17 @@
+#define CATCH_CONFIG_MAIN
+#include <catch2/catch_all.hpp>
+#include <util/io-redirector.h>
+#include <iostream>
+#include <cstdio>
+
+TEST_CASE( "io-redirector", "[io-redirector]" ) {
+    util::IoRedirector::get().start();
+    auto result1 = util::IoRedirector::get().get_output();
+    printf("Some output");
+    std::cout<<"Some other output"<<std::endl;
+    auto result2 = util::IoRedirector::get().get_output();
+    util::IoRedirector::get().stop();
+
+    REQUIRE( result1=="" );
+    REQUIRE( result2=="Some outputSome other output\n" );
+}