Some commands have named arguments named "name", which conflict with
the "name" entry used to specify command name in mpv_command_node, so
they cannot be used with mpv_command_node.
These commands include:
set, del, change-list, add, cycle, multiply, enable-section,
disable-section, define-section, script-binding, keybind, keypress,
keydown, keyup, apply-profile.
This makes mpv_command_node accept command name as key "_name", so
"name" can be used to specify command arguments. For compatibility,
if "_name" entry does not exist, then "name" is used as fallback.
