## Summary of the Pull Request
Enables the user to provide arbitrary argument values to shortcut actions through a new `args` member of keybindings. For some keybindings, like `NewTabWithProfile<N>`, we previously needed 9 different `ShortcutAction`s, one for each value of `Index`. If a user wanted to have a `NewTabWithProfile11` keybinding, that was simply impossible. Now that the args are in their own separate json object, each binding can accept any number of arbitrary argument values.
So instead of:
```json
{ "command": "newTab", "keys": ["ctrl+shift+t"] },
{ "command": "newTabProfile0", "keys": ["ctrl+shift+1"] },
{ "command": "newTabProfile1", "keys": ["ctrl+shift+2"] },
{ "command": "newTabProfile2", "keys": ["ctrl+shift+3"] },
{ "command": "newTabProfile3", "keys": ["ctrl+shift+4"] },
```
We can now use:
```json
{ "command": "newTab", "keys": ["ctrl+shift+t"] },
{ "command": { "action": "newTab", "index": 0 }, "keys": ["ctrl+shift+1"] },
{ "command": { "action": "newTab", "index": 1 }, "keys": ["ctrl+shift+2"] },
{ "command": { "action": "newTab", "index": 2 }, "keys": ["ctrl+shift+3"] },
```
Initially, this does seem more verbose. However, for cases where there are multiple args, or there's a large range of values for the args, this will quickly become a more powerful system of expressing keybindings.
The "legacy" keybindings are _left in_ in this PR. They have helper methods to generate appropriate `IActionArgs` values. Prior to releasing 1.0, I think we should remove them, if only to remove some code bloat.
## References
See [the spec](https://github.com/microsoft/terminal/blob/master/doc/specs/%231142%20-%20Keybinding%20Arguments.md) for more details.
This is part two of the implementation, part one was #2446
## PR Checklist
* [x] Closes#1142
* [x] I work here
* [x] Tests added/passed
* [x] Schema updated
## Validation Steps Performed
* Ran Tests
* Removed the legacy keybindings from the `defaults.json`, everything still works
* Tried leaving the legacy keybingings in my `profiles.json`, everything still works.
-------------------------------------------------
* this is a start, but there's a weird linker bug if I take the SetKeybinding(ShortcutAction, KeyChord) implementation out, which I don't totally understand
* a good old-fashioned clean will fix that right up
* all these things work
* hey this actually _functionally_ works
* Mostly cleanup and completion of implementation
* Hey I bet we could just make NewTab the handler for NewTabWithProfile
* Start writing tests for Keybinding args
* Add tests
* Revert a bad sln change, and clean out dead code
* Change to include "command" as a single object
This is a change to make @dhowett-msft happy. Changes the args to be a part
of the "command" object, as opposed to an object on their own.
EX:
```jsonc
// Old style
{ "command": "switchToTab0", "keys": ["ctrl+1"] },
{ "command": { "action": "switchToTab", "index": 0 }, "keys": ["ctrl+alt+1"] },
// new style
{ "command": "switchToTab0", "keys": ["ctrl+1"] },
{ "command": "switchToTab", "args": { "index": 0 } "keys": ["ctrl+alt+1"] },
```
* schemas are hard yo
* Fix the build?
* wonder why my -Wall settings are different than CI...
* this makes me hate things
* Comments from PR
* Add a `Direction::None`
* LOAD BEARING
* add some GH ids to TODOs
* add a comment
* PR nits from carlos
6a4c737686