Support for name unmangling

[Recognition2]

The flamegraph contains a lot of special characters that can be replaced to make the graph more readable.
Yamakaky wrote a script that fixes this.
We could sed over the svg directly, except for this line: s/[^\.]\.[^\.]/./g which breaks the svg format.

Original:

Improved:

Can we support this?

[jasonrhansen]

#68 updated the inferno version, which should give improved demangling of Rust symbols. This issue can probably be closed.