States of loon objects can be accessed `[` and l_cget
and modified with l_configure.
l_state_names(target)state names
either an object of class loon or a vector that specifies the
widget, layer, glyph, navigator or context completely. The widget is
specified by the widget path name (e.g. '.l0.plot'), the remaining
objects by their ids.
In order to access values of a states use l_info_states.
l_info_states, l_cget, l_configure
Other loon interactive states:
l_hist(),
l_info_states(),
l_plot(),
l_serialaxes(),
names.loon()