Split window support more than 2 windows on high resolution displays

[archenroot]

Hi,

use this shinning piece of software for few years already, very good stuff first of all!

while working on big 4k screens (40"-50") I realized it could be useful to have window Split function capable of working with more than 2 windows at time and also mixing the vertical with horizontal split. So the result could be variants of matrices. Either we could go with default 4 window split (2 horizontal for 2 vertical ), or lets make it generic and configurable somewhere in global settings, so I can for example open predefined cluster in 3 horizontal with 4 vertical in total 12 windows, based on my screen config.

What do you think?