Remove alpha and beta categories. Mark nodes in development by frames.

Слиты nikitronn запросил слияние mark_beta_nodes в master

Created by: Durman

Addressed problem description

It's implementation of this proposal #4685 Now nodes in development can be marked by frames. To do this alpha or beta icon should be added to a node class.

class Node:
    sv_icon = 'SV_ALPHA`  # or 'SV_BETA`

image

I moved some (seems to me as redundant) nodes from removed categories to old nodes. Some nodes marked as Alpha/Beta nodes. I does not have strong option about whether I've made changes correct so if someone has any suggestions they are welcome.

Preflight checklist

  • Code changes complete.
  • Code documentation complete.
  • Documentation for users complete (or not required, if user never sees these changes).
  • Ready for merge.