UI for displaying Windows Terminal version is unexpected; suggest printing version to STDOUT rather than displaying in dialog box

[hcwesson]

Description of the new feature/enhancement

The wt --version command should produce textual output within the terminal context, i.e. via STDOUT; this is typical behavior for many CLI utilities. Output to STDOUT is easily parsed and script-friendly, and does not disrupt user workflow.

Examples:
python --version

bash --version

choco --version

As of WT version 1.9.1445.0, issuing the wt --version command spawns a dialog box with the Windows Terminal version number:

This is unexpected, and non-optimal for the following reasons:

• The dialog box results in loss of focus of the terminal window
• The version number contained in the dialog box can't be selected, and therefore can't be copied to the clipboard
• The dialog box interface doesn't allow for (trivial) programmatic access to the version number

Proposed technical implementation details (optional)

Desired behavior: instead of outputting the current version in a dialog box, output directly to the issuing shell instance (using some facility such as the Write-Object cmdlet, possibly).

[DHowett]

this is typical behavior for many CLI utilities

This is very much the part that makes this impossible. WT is not a CLI utility. If it were, Windows would force it to have an empty console window when we started it 😄

There's a lot (a LOT) more information in this discussion (section "displaying output in a dialog"): #4570 (comment)

[DHowett]

There's also a plan for fixing this at the Windows OS level here: https://github.com/microsoft/terminal/blob/dev/duhowett/spec/console-allocation/doc/specs/%237335%20-%20Console%20Allocation%20Policy.md