[FEATURE-REQUEST] Support vertical carousels

[FRSgit]

Is your feature request related to a problem? Please describe.
There possibly are some use cases where vertical carousels might be needed.

Describe the solution you'd like
Support for vertical carousel either via vertical option in a config or a separate carousel initialiser.

Describe alternatives you've considered
Thought about rotating the whole carousel by 90degrees clockwise and every slide by 90deg counter-clockwise? But that probably would lead to some boxModel-sizing-related issue (and possibly others - like some blurry rendering, etc).

Note: this is a proposal, if you feel that this feature should/shouldn't be implemented, please use 👍 and 👎 reactions. Of course you're welcome to file as PR as well! 😄