Separate pointer resize interval #1261

[loiccoyle]

BSPWM doesn't play too well with resizing OpenGL applications #1261 , I ran into this problem when trying out Alacritty see issue alacritty/alacritty#4813.

The workaround is to lower the pointer_motion_interval which seems to aleviate the issue, but also makes moving floating windows around feel janky which is especially annoying on high refresh rate monitors.

In this PR, I just added a separate pointer_motion_interval_resize setting which allows the user to only limit the resize events, keeping the floating window movement fluid.

This is still not ideal as it seems the root of the problem resides somewhere in the nvidia drivers (?), but that is way above my head.

Hopefully this helps someone.