Deterministic printer output

[lucas-manuel]

Describe the desired feature

When running: slither <file> --print function-summary and slither <file> --print vars-and-auth

The order or values in the arrays changes between runs. Examples below:

The intention was to run slither printers and write to files when updating submodules to check diffs, but since the order of the outputs in the arrays in non-deterministic, the diffs are too large to be usable.

Easiest solution in my opinion would be to simply alphabetically order the array values.