Add sitting, clapping, and salute emote actions.

[Gigabyte5671]

• Sitting action (default keybind G) snaps to nearby applicable objects (with animate_ at the start of their mesh names). This action has multiple variations:

  • Chair:
    
  • Beanbag:
    
  • Ground:
    
    (This action is extensible, any animation can be played by including the animation's name in the name of the snap object).

• Clapping emote (default keybind H).
  

• Salute emote (default keybind J).
  

• Show icons (nametags) above interactable objects:
  

This PR also adds a button to the Help menu, allowing the player to reset their settings:

[Gigabyte5671]

A few more changes need to be made before this PR is ready:

• ✅ Emotes (clapping, salute) need to be repeatable.
• ✅ Emote animations should loop for the duration that the emote key is being held down, to allow emoting for any length of time.
• Issue Avatar's collider needs to be disabled while sitting to prevent collisions with the chair and ground. #140 ➡️ The avatar's collider needs to be disabled while sitting to prevent collisions with the chair and ground.
• ✅ Interactable objects (chairs, etc) should display an icon to show that they are interactable:
  
  
• Issue Interacting with an object in-world needs to play any animations attached to that object. #141 ➡️ Interacting with an object needs to play any animations attached to that object.
• Issue The avatar's bounding box needs to be recalculated when in a sit/pose animation. #142 ➡️ The player's nametag's height needs to reduce to match the height of the sitting pose. Eg:
  
• Issue The avatar's bounding box needs to be recalculated when in a sit/pose animation. #142 ➡️ The camera's target point needs to change to match the height of the sitting pose.
• Issue A new state needs to be added to keep track of the player's sitting/interactions. #143.

[Gigabyte5671]

Note: Updated the build_test workflow with a workaround for a recent breaking change in Node 17. References: [1], [2], [3].

[Gigabyte5671]

@digisomni I've created issues #140, #141, #142, and #143 to track bugs related to this feature.

The merge conflicts need to be resolved whilst merging the PR. Attempting to resolve before merge will break either this build or master. Lmk when you would like to merge this and I can resolve the conflict 👍.