Wrong scope descriptions in puffin viewer when running profiled program multiple times

[rasmusgo]

Describe the bug
The scope ids may change between different runs of the same program depending on the order the scopes are encountered as the program runs. This results in misleading information in the viewer.

To Reproduce
Steps to reproduce the behavior:

1. Start puffin viewer
2. Run program with random ordering of scopes
3. Close the program but not the puffin viewer
4. Run the same program again
5. See that the scope descriptions are wrong

Expected behavior
The scope descriptions should be correct even when running the program multiple times without restarting the viewer.

Screenshots
If applicable, add screenshots to help explain your problem.

Device:

• OS: Windows
• Browser: N/A
• Version puffin 0.19, puffin_http 0.16

Additional context
I think this problem is related to #169