[Feature Request] Automatic Split View when Invoked with Multiple Paths
### Detailed Description

At the moment, a command like `moe a.nim b.nim c.nim` will cause the editor to only open the last given path (`c.nim`).  I would like to ask for a new feature such that, if multiple paths should be specified, Moe would open them optionally in multiple sub-windows as if the user would have typed something like:

1. `moe a.nim`
2. `:vs`
3. Move to right sub-window.
4. `:e b.nim`
5. `:vs`
6. Move to right sub-window.
7. `:e c.nim`

This behaviour could be named `startUpAutoSplit` and should be configurable such that the user might decide whether the current behaviour shall be kept (e.g. `legacy`), or the window shall be subdivided `horizontally` (`:sv` command) / `vertically` (`:vs` command).  I would like to suggest defining `vertically` (`:vs` command) being the default as I assume that most screens are rather in landscape than in portrait mode, and other editors like Kate have a similar behaviour when passing multiple paths to the application, i.e. Kate would open each one in a separate tab.