make space for window borders

change cursor during move and resize

style in buttonpress

simplify move/resizemouse functions

funnel all resizing through resize()

use exit code macros everywhere

some comments and reminders

update README

it's time

factor out renderclients

This will help once we get to implementing layer-shell

don't autoraise

Still raise in buttonpress and focusstack of course.  Focus models
honestly wouldn't be too hard to make into a config.h option.

use the focus stack to determine stacking order

Suddenly we have autoraise!

adopt a bit more dwm-like terseness

change focus(NULL, NULL) to mean unfocus

"Focus the most recently focused window on selmon" is now refocus()

implement focusmon and tagmon

focus follows mouse

add incnmaster and setmfact commands

add toggletag and toggleview

don't detect non-visible clients under cursor

add tag and view functions

refocus if focused client is unmapped

focus(NULL, NULL) works like dwm's focus(NULL): focus the most recent
visible client on selmon, or clear the existing focus if there are none.