## Summary of the Pull Request
You no longer _need_ to specify the `split` argument to `splitPane`, it will default to `Automatic` instead of `None`
## PR Checklist
* [x] Closes a discussion we had in team sync
* [x] I work here
* [x] Tests updated
* [n/a] Requires documentation to be updated
## Detailed Description of the Pull Request / Additional comments
Also disables the tests that are broken in #5169 while I investigate
## Summary of the Pull Request
This PR will make the existing `Tab` class into a WinRT type. This will allow any XAML to simply bind to the `ObservableVector` of Tabs.
This PR will be followed up with a future PR to change our TabView to use the ObservableVector, which will in turn eliminate the need for maintaining two vectors of Tabs. (We currently maintain `_tabs` in `TerminalPage` and we also maintain `TabView().TabViewItems()` at the same time as described here: #2740)
## References
#3922
## PR Checklist
* [x] CLA signed.
* [x] Tests added/passed
## Detailed Description of the Pull Request / Additional comments
I've currently only exposed a Tab's Title and IconPath to keep things simple. I foresee XAML elements that bind to Tabs to only really need these two properties for displaying.
I've also converted `TerminalPage`'s `std::vector<std::shared_ptr> _tabs` into a `IObservableVector<winrt::TerminalPage::Tab> _tabs` just so that future PRs will have the ground set for binding to this vector of tabs.
## Validation Steps Performed
Played around with Tabs and Panes and all sorts of combinations of keybindings for interacting with tabs and dragging and whatnot, it all seemed fine! Tab Tests also all pass.
This commit fixes an issue where "wt -d C: wsl -d Alpine" would be
parsed as "wt -d C: -d Alpine wsl" and rejected as invalid due to the
repeated -d. It also fixes support for the option parsing terminator,
--, in all command lines.
Fixes#4277.
## Summary of the Pull Request
Adds support for commandline arguments to the Windows Terminal, in accordance with the spec in #3495
## References
* Original issue: #607
* Original spec: #3495
## PR Checklist
* [x] Closes#607
* [x] I work here
* [x] Tests added/passed
* [ ] We should probably add some docs on these commands
* [x] The spec (#3495) needs to be merged first!
## Detailed Description of the Pull Request / Additional comments
🛑 **STOP** 🛑 - have you read #3495 yet? If you haven't, go do that now.
This PR adds support for three initial sub-commands to the `wt.exe` application:
* `new-tab`: Used to create a new tab.
* `split-pane`: Used to create a new split.
* `focus-tab`: Moves focus to another tab.
These commands are largely POC to prove that the commandlines work. They're not totally finished, but they work well enough. Follow up work items will be filed to track adding support for additional parameters and subcommands
Important scenarios added:
* `wt -d .`: Open a new wt instance in the current working directory #878
* `wt -p <profile name>`: Create a wt instance running the given profile, to unblock #576, #1357, #2339
* `wt ; new-tab ; split-pane -V`: Launch the terminal with multiple tabs, splits, to unblock #756
## Validation Steps Performed
* Ran tests
* Played with it a bunch
