Fix bidirectional highlight when node identifier contains ":" symbol

[liijunwei]

fix: https://github.com/tintinweb/vscode-interactive-graphviz/issues/172

I have limited javascript experience and I'd like to keep the change minimum so I just copied latest GraphvizSvg.prototype.linkedTo and GraphvizSvg.prototype.linkedFrom implementation from https://github.com/mountainstorm/jquery.graphviz.svg I expect there is no much behavior change

after the fix:

[liijunwei]

would like PR being reviewed and ship the fix to vscode extension store, so I don't have to use the workaround, really appreciate it