Previously this was possible via key bindings, since this operation was removed,
its useful to be able to configure which mouse keys do what.
This example swaps LMB/RMB
```
bspc config pointer_action1 resize_corner
bspc config pointer_action3 move
```
A receptacle is an unfocusable empty leaf node.
Receptacles are used for building a tree without creating windows.
Example:
bspc node -i
bspc node @/ -p east -i
bspc node @/2 -p north -i
bspc rule -a Abc:abc -o node=@/1
bspc rule -a Ijk:ijk -o node=@/2/1
bspc rule -a Xyz:xyz -o node=@/2/2
Fixes#259.
Along the way, we also fixed the handling of the `*_padding`,
`window_gap` and `border_width` settings. The previous behavior was the
result of a bad decision (9fed780), as a response to #141. Many issues
followed: #143, #158, #260, etc. We now handle those settings as
intuitively as possible.
We also fixed a potential segfault in `cmd_node`, triggered by `bspc
node -d`[sic].
Fixes#402#252.
There's no constraints on desktop and monitor names, therefore, using a
desktop or monitor name as descriptor is ambiguous.
We put an end to this ambiguity by introducing desktop and monitor IDs.
`bspc query -{M,D}` now yields IDs instead of names.
Fixes#397.
It is now easy to access any attribute by piping the output of
`query -T` to a JSON extractor/filter.
E.g.:
bspc query -T -d DESKTOP_SEL | jq -r .layout
And it also makes `restore -T` more robust.
Stacking now involves 3 layers: BELOW, NORMAL and ABOVE.
In each layers, floating windows are stacked above tiled windows.
The *stack* function is now extremely simple: it just inserts an item in
a sorted list, relying on *stack_cmp* to compare clients.
Fullscreen windows are no longer special.
Because many clients (e.g. termite) prevent us (maybe unknowingly) from
capturing motion events on their windows, we're forced to create a
window for this sole purpose.
Grabbing the pointer isn't an option, because it forces us to consider
some of the enter notify events we should be ignoring.
It appears that unmapping windows might generate undesirable enter
notify events. It can lead a very nasty bug where the focus constantly
switches between two desktops ad infinitum (cf. #268).
