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Always redirect stdin to null (fix tools tty detection, in particular avrdude running in safe mode) (#897)

Some tools detects if the program is running from terminal by looking at the stdin/out bindings.
Previously stdin wasn't bound to any custom stream, this fact lead avrdude to think it was run from terminal (instead of a script) and start it in "safe-mode". This turn out to be a problem in some cases, see #844

* Removed useless stdout/err listeners

They are immediatly overwritten on the next line.

* Always pipe stdout/err/in when running tools.

This is required because some tools detects if the program is running
from terminal by looking at the stdin/out bindings.

Fix: https://github.com/arduino/arduino-cli/issues/844

* Do not use NullWriter in executils by default.

This is not strictly required for the 'avrdude' hack.