Feature request: make backtrace clickable

[flip111]

When having a backtrace like

when clicking on SvnRevision::exportInternal in

#6  0x000055c86f1d38a0 in SvnRevision::exportInternal (this=0x7ffcff8a3e40, key=0x55c86f52c758 "/trunk/lang/sk.po", change=0x7f5be7291998, path_from=0x0, rev_from=-1, current=..., rule=..., matchRules=...) at svn.cpp:874

that it opens the source file and jumps to the function https://github.com/svn-all-fast-export/svn2git/blob/572a8ba5526063685a597d1d45eb0434559145a2/src/svn.cpp#L704

And when clicking svn.cpp:874 it goes here https://github.com/svn-all-fast-export/svn2git/blob/572a8ba5526063685a597d1d45eb0434559145a2/src/svn.cpp#L874