## Summary of the Pull Request
This enables the user to set a number of extra settings in the `NewTab` and `SplitPane` `ShortcutAction`s, that enable customizing how a new terminal is created at runtime. The following four properties were added:
* `profile`
* `commandline`
* `tabTitle`
* `startingDirectory`
`profile` can be used with either a GUID or the name of a profile, and the action will launch that profile instead of the default.
`commandline`, `tabTitle`, and `startingDirectory` can all be used to override the profile's values of those settings. This will be more useful for #607.
With this PR, you can make bindings like the following:
```json
{ "keys": ["ctrl+a"], "command": { "action": "splitPane", "split": "vertical" } },
{ "keys": ["ctrl+b"], "command": { "action": "splitPane", "split": "vertical", "profile": "{6239a42c-1111-49a3-80bd-e8fdd045185c}" } },
{ "keys": ["ctrl+c"], "command": { "action": "splitPane", "split": "vertical", "profile": "profile1" } },
{ "keys": ["ctrl+d"], "command": { "action": "splitPane", "split": "vertical", "profile": "profile2" } },
{ "keys": ["ctrl+e"], "command": { "action": "splitPane", "split": "horizontal", "commandline": "foo.exe" } },
{ "keys": ["ctrl+f"], "command": { "action": "splitPane", "split": "horizontal", "profile": "profile1", "commandline": "foo.exe" } },
{ "keys": ["ctrl+g"], "command": { "action": "newTab" } },
{ "keys": ["ctrl+h"], "command": { "action": "newTab", "startingDirectory": "c:\\foo" } },
{ "keys": ["ctrl+i"], "command": { "action": "newTab", "profile": "profile2", "startingDirectory": "c:\\foo" } },
{ "keys": ["ctrl+j"], "command": { "action": "newTab", "tabTitle": "bar" } },
{ "keys": ["ctrl+k"], "command": { "action": "newTab", "profile": "profile2", "tabTitle": "bar" } },
{ "keys": ["ctrl+l"], "command": { "action": "newTab", "profile": "profile1", "tabTitle": "bar", "startingDirectory": "c:\\foo", "commandline":"foo.exe" } }
```
## References
This is a lot of work that was largely started in pursuit of #607. We want people to be able to override these properties straight from the commandline. While they may not make as much sense as keybindings like this, they'll make more sense as commandline arguments.
## PR Checklist
* [x] Closes#998
* [x] I work here
* [x] Tests added/passed
* [x] Requires documentation to be updated
## Validation Steps Performed
There are tests 🎉
Manually added some bindings, they opened the correct profiles in panes/tabs
dd1c7b3e52