Provide basic file pattern matching for scenarios in the 'run' command.

[Dandielo]

Is your feature request related to a problem? Please describe.
Currently we experience the 'scenarios.json' file to explode due to every action bein atomic, which ends with lots of unnecessary duplication.

Describe the solution you'd like
An ideal thing would be that we could describe file patterns and run a command for each matched file.
Even better a simple way to extend the FastBuild scripts and then run build commands for these scenarios.