Support multiple scripts, wildcard names, and parallel execution

[xt0rted]

Much like npm-run-all we should be able to do something like dotnet r *:build --parallel and have all scripts ending with :build run in parallel. Leaving off the --parallel option should run them sequentially.

The wildcard matching should work anywhere in the script name, not just at the start/end. It should also be optional and specifying a list of script names should also work such as dotnet r clean build test or dotnet r unittest e2etest --parallel.

Tasks

• Multiple script execution (Add the ability to run multiple scripts in series #10)
• Wildcard name support (Support for globbing in script names #79)
• Parallel script execution