0.13: Support interactive custom commands in dev mode

[shumailxyz]

Current Behavior

Some custom commands may be interactive and require stdin. This is not supported in the dev command atm.

Expected behavior

Interactive custom commands work in dev mode.

Suggested solution(s)

Would need to look for a way for input handling (either by popping out a new terminal window or similar). Also we may need to introduce a flag e.g. interactive: true to command and catch that when ran in dev. Proposed by @edvald: