feat: command line options for open an existing project and creating a new one

[brmassa]

151

Open and Create project commands

• prowl --project PATH or prowl open --project PATH will open Prowl project located in PATH (open keyword is optional)
• prowl create --project PATH will create a new Prowl project located in PATH

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During development, one could run dotnet CLI using

dotnet run --project Prowl.Editor/ -- open --project PATH

or

dotnet run --project Prowl.Editor/ -- --project PATH