Change window placement of warp command to be more natural

[koekeishiya]

When a window is warped in a cardinal direction it should set the window placement (first_child, second_child) according to the direction it came from, to make the movement more natural.

Current behaviour:

+---------+               +---------+                                         
|    |    |               |    |    |                                       
|    |  b |   warp west   | a  |    |                                     
| a  |----|   b  -->  a   |----|  c |                                    
|    |  c |               | b  |    |                              
|    |    |               |    |    |                                  
+---------+               +---------+                               

The more natural result would be:

+---------+               +---------+                                         
|    |    |               |    |    |                                       
|    |  b |   warp west   | b  |    |                                     
| a  |----|   b  -->  a   |----|  c |                                    
|    |  c |               | a  |    |                              
|    |    |               |    |    |                                  
+---------+               +---------+                               

Same thing here:

+---------+               +---------+                                         
|         |               |    |    |                                       
|    a    |   warp north  | a  |  b |                                     
|----|----|   b  -->  a   |----|----|                                    
| b  |  c |               |    c    |                              
|    |    |               |         |                                  
+---------+               +---------+                               

The more natural result would be:

+---------+               +---------+                                         
|         |               |    |    |                                       
|    a    |   warp north  | b  |  a |                                     
|----|----|   b  -->  a   |----|----|                                    
| b  |  c |               |    c    |                              
|    |    |               |         |                                  
+---------+               +---------+                               

[FelixKratz]

I have decided to implement this: FelixKratz@c7ae69a
It feels very nice