Validation file format:
Every entry begins with a line describing the validation type. Then the data for that validation type follows. 

performance data looks like:

performance
[step name]
[fps data string]


rendering data looks like:

screenshot
[step name]
[screenshot name]

console
[step name]
[number of lines in this step's console output]
[this step's console output]


custom
[step name]
[number of lines in this step's text output]
[this step's text output]