Just like in #9760, we can't actually use the UWP file picker API, because it will absolutely not work at all when the Terminal is running elevated. That would prevent the picker from appearing at all. So instead, we'll just use the shell32 one manually.
This also gets rid of the confirmation dialog, since the team felt we didn't really need that. We could maybe replace it with a Toast (#8592), but _meh_
* [x] closes#11356
* [x] closes#11358
* This is a lot like #9760
* introduced in #11062
* megathread: #9700
## Summary of the Pull Request
This adds a new setting `intenseTextStyle`. It's a per-appearance, control setting, defaulting to `"all"`.
* When set to `"all"` or `["bold", "bright"]`, then we'll render text as both **bold** and bright (1.10 behavior)
* When set to `"bold"`, `["bold"]`, we'll render text formatted with `^[[1m` as **bold**, but not bright
* When set to `"bright"`, `["bright"]`, we'll render text formatted with `^[[1m` as bright, but not bold. This is the pre 1.10 behavior
* When set to `"none"`, we won't do anything special for it at all.
## references
* I last did this in #10648. This time it's an enum, so we can add bright in the future. It's got positive wording this time.
* ~We will want to add `"bright"` as a value in the future, to disable the auto intense->bright conversion.~ I just did that now.
* #5682 is related
## PR Checklist
* [x] Closes#10576
* [x] I seriously don't think we have an issue for "disable intense is bright", but I'm not crazy, people wanted that, right? https://github.com/microsoft/terminal/issues/2916#issuecomment-544880423 was the closest
* [x] I work here
* [x] Tests added/passed
* [x] https://github.com/MicrosoftDocs/terminal/pull/381
## Validation Steps Performed
<!--  -->
Yea that works. Printed some bold text, toggled it on, the text was no longer bold. hooray.
### EDIT, 10 Aug
```json
"intenseTextStyle": "none",
"intenseTextStyle": "bold",
"intenseTextStyle": "bright",
"intenseTextStyle": "all",
"intenseTextStyle": ["bold", "bright"],
```
all work now. Repro script:
```sh
printf "\e[1m[bold]\e[m[normal]\e[34m[blue]\e[1m[bold blue]\e[m\n"
```
## Summary of the Pull Request
Adds unfocused appearance creation/configuration in the SUI
There is now an 'Unfocused Appearance' section at the bottom of the 'Appearance' tab in a profile. There is a '+' button to create an unfocused appearance if one does not exist, or a delete button to delete the unfocused appearance if one exists (only one of these buttons is visible at a time).
## PR Checklist
* [ ] Closes #xxx
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] Tests added/passed
* [ ] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
* [ ] Schema updated.
* [x] I work here
## Validation Steps Performed
Implements an `Appearances` xaml object and an `AppearanceViewModel` in the SettingsEditor project. Updates `Profiles` to use these new objects for its default appearance.
This is the first step towards getting `UnfocusedAppearance` into the SUI.
