Dandelion transactions

[barrystyle]

This PR completes the Dandelion transaction implementation that was provided with v22.0

[JaredTate]

Awesome! Great to see this dandelion contribution. The code looks straighforward. So it builds, but looks like a segfault in tests:

osx:
addrman_tests from test/addrman_tests.cpp /bin/sh: line 1: 97492 Segmentation fault: 11 test/test_digibyte --catch_system_errors=no -l test_suite -t "cat test/addrman_tests.cpp | grep -E "(BOOST_FIXTURE_TEST_SUITE\\(|BOOST_AUTO_TEST_SUITE\\()" | cut -d '(' -f 2 | cut -d ',' -f 1 | cut -d ')' -f 1" -- DEBUG_LOG_OUT > test/addrman_tests.cpp.log 2>&1 Running 18 test cases... Entering test module "DigiByte Core Test Suite" test/arith_uint256_tests.cpp:20: Test suite "arith_uint256_tests" is skipped because disabled test/addrman_tests.cpp:132: Entering test suite "addrman_tests" test/addrman_tests.cpp:134: Entering test case "addrman_simple" make[3]: [test/addrman_tests.cpp.test] Error 1 make[2]: [check-am] Error 2 make[1]: * [check-recursive] Error 1

Linux:

../build-aux/test-driver: line 107: 24404 Segmentation fault (core dumped) "$@" > $log_file 2>&1 FAIL: qt/test/test_digibyte-qt

[JaredTate]

I am not able to reproduce segfault errors locally, I get it to build and make check fine. Will go ahead and merge it into the feature branch. Thanks again Barry!