Echo builtin
Created by: paezao
Problem: Adding coreutils/echo as a ion builtin command
Solution: I have added the full coreutils/echo source code as a builtin command and changed it slightly to work with ion API
Changes introduced by this pull request:
- Added coreutils as a dependency to make use of ArgParser
- Added a new echo.rs to src/builtins containing the echo functionality
- Added a command at src/builtins/mod.rs to call the new echo function
- Added echo command to src/shell/job.rs making it possible to pipeline
State: ready