Remove the deprecated MyAvatar.setToggleHips() method

[ctrlaltdavid]

[x] Mark as "deprecated" in API docs. ... Already done some time ago.
[ ] Make the method a no-op, and log a warning in the program log. ... 2021.1.1: #1047
[ ] Make the method notify users via notifications.js when it is used.
[ ] Notify in Discord.
[ ] Remove the method the second release after notifying in Discord.

[HifiExperiments]

we have a lot of deprecated methods that started this process and never actually got removed...at some point we should actually remove them lol

[digisomni]

Does anyone wanna go remove some ancient ones? :D 🗡️

[stale]

Hello! Is this still an issue?

[daleglass]

Dev meeting: this might happen at the same time as scripting engine switch

[stale]

Hello! Is this still an issue?

[stale]

Hello! Is this still an issue?