Made all header files to have LABWC_ prefix in include guard identifers.
Converted from __LABWC_ in 35 include/ files.
Converted from __LAB_ in 5 include/ files.
Added LABWC prefix to 3 include/ files.
Added include guards to 3 include/ files.
The double underscores were removed since according to C standard
those "are always reserved for any use".
This can be used to better control Virtual Machines, VNC clients, nested
compositors or similar. All keybinds other than ToggleKeybinds itself are
disabled when first called, a 2nd call will restore handling of all keybinds.
Fixes#738Fixes#810
.. and use it within src/config/rcxml.c and src/menu/menu.c.
This fixes being unable to use the `direction` argument in menu entries.
Reported-by: mahk via IRC