Push updated creator settings via web service

[tzarebczan]

Use case would be a creator changing a min superchat amount or comment amount during stream - the UI would need to know. For now, we'll recall settings when they try to tip.

[infinite-persistence]

One corner-case:

• There is a time gap between the SDK.support_create and Commentron.comment_create which can be significant if there was a network delay, especially with channel_sign. If the creator changed the min-tip setting during this gap, the tip would still be sent/wasted and the comment be blocked.
• Under normal situation, that duration was already 2s
  •