Add proper stdin capabilities to Python tools

[antaenc]

Can detect in python values were sent in via stdin, adjust how the main cmd module loop works to detect commands were sent in via stdin and don't show the cmd prompt - for example (g2cmd). Add new arg to enable/disable the showing of commands from stdin as well as their output; similar to sending in a file but I may not want to see the command(s) sent in.

Ant has this prototyped but not tested. This is very useful for quick commands and testing and follows standard LInux principles for CLIs.