Exiting gosdnc causes the input in cli to be invisble

Description

After exiting gosdnc, there is the issue that all the follwing input in the original calling cli becomes invisible. Only calling a reset fixes this issue at the moment. We can improve this by changing the way we quit inside gosdnc. Instead of calling os.Exit(0) we should make use of go channels or a context. os.Exit(0) shuts down the application immediately without calling any defer function, which makes this impossible to deal with at the moment. With the use of a channel or context, we can make use of a graceful shutdown method instead. Inside this shutdown we can handle the invisible input issue in the cli, for example like it is done here: Terminal does not display command after go-prompt exit

This might also allow to use Ctrl-C to quit gosdnc in prompt mode in addition to writing the exit command.

Expected Behavior

Input in calling cli is visible after exiting gosdnc.

Actual Behavior

Input in calling cli is invisible after exiting gosdnc.

Possible Fix

See description.

Steps to Reproduce

1. Call gosdnc prompt
2. Exit the application