factor out parse_tracker_response and add unit tests. make gen_todo cover tests also, and regenerate todo.html

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10337 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged changes from RC_1_0

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10340 a83610d8-ad2a-0410-a6ab-fc0612d85776
merged fix from RC_1_0

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10343 a83610d8-ad2a-0410-a6ab-fc0612d85776