[Feature/Bug] Add option to switch among vertical and horizontal split for new window

[rtoscanelli]

Is your feature request related to a problem? Please describe.
I like the binary tree and half options to automatically add a new window to the right, however I find it limited compare to other window managers (I understand that this is a script and not a proper window manager).

Describe the solution you'd like
I would like to have the option to "togglesplit" between horizontal and vertical, meaning that if I have two windows side by side with togglesplit the windows would move to be up and down. I find this nice in cases where I have two terminals open (on at the top and on at the bottom, however I like the default side by side configuration for everything else).

[Pablokiryu]

+1 to this. exact same use case :D