Remove CliFx and Implement a new solution for cli.

[yldrefruz]

Currently ebuild's cli use the CliFx. This was good for the beginning stage of the application. However
we need more complex usages:

• supplying the same flag for creating multiple definitions with different usages -D X=1 -D Y=1 -DA=1 -D"B=1".
• Changing previous usage. -D X=1 -DX=2 must define X as 2.
• Making it so subcommands are creatable easily instead of specifying in multiple places.
• Displaying help for the current command when there is an error.
• Global arguments.
• Local-only arguments (arguments that should be specified for a specific command like ebuild -v generate compile_commands.json) so a flag can have multiple meanings for different commands.
• Extensibility for plugins (this requires us to create a new project.)

So a new project will be added to the ebuild solution named ebuild.cli