[Editor] CLI commands

[brmassa]

It would be nice to have a series of options and arguments when calling Prowl.

Features:

• [x] Open project: prowl --project PATH
• [x] Create project: prowl new --project PATH
• [ ] Build project: prowl build --project PATH --output PATH
• [x] Version: prowl version

references:

• https://docs.unity3d.com/Manual/CommandLineArguments.html
• https://docs.flaxengine.com/manual/editor/advanced/command-line-access.html

[brmassa]

in #152 , ive used the term create instead new.

NOTE: consider adding a local README.md inside Prowl.Editor/Editor/CLI explaining all the command line commands for reference.

[brmassa]

prowl version (prowl.exe version) implemented automatically by CommandLineParser