Dictionary in and dictionary out nodes

Слиты nikitronn запросил слияние dictionary_socket в b28_prelease_master

Created by: Durman

Addressed problem description

#2766 (closed)

image

Todo:

  • Take default name of key from linked socket.
  • Keep links of dictionary out nodes when a key of a dictionary was renamed. Next time or probably it even does not worth complicate too much. Simplest solutions was adding custom attribute for dictionaries.
  • Robustness of determining type of output sockets. Next time. Simplest solutions was adding custom attribute for dictionaries.
  • Consider handling of several dictionaries in list (ignoring mismatched keys?).
  • Сustom draw for all sockets.
  • Is_linked should have name was_linked before start of update event, more correct test is socket.links but as I suppose more expensive as well. Looks like in sv_get method is_linked should be replaced by links.
  • deepcopy = False where it possible Deep copy is not implemented for dictionaries. In next PR.
  • New dictionary icons 😄

Preflight checklist

  • Code changes complete.
  • Code documentation complete.
  • Documentation for users complete.
  • Manual testing done.
  • Ready for merge.