Cache `_NET_WM_STATE` property and add rule target `wm_state`#549

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tryone144 wants to merge 3 commits intoyshui:nextfrom tryone144:wm_state-target

+292-135

Commits on Nov 29, 2020

c2: Perform matching against "all" property values if no index is specified
tryone144
committed
win: cache _NET_WM_STATE property for each window
tryone144
committed
c2: add new predefined target wm_state to match against _NET_WM_STATE in string
tryone144
committed