Implement dropdown for adding transferred contents

[ApolloZhu]

Important

This merges into mvp instead of master, unless mvp has already been merged into master

Changelog

• Shows an auto-updating list of files in any dropdown (currently added to the main dashboard)
• On selecting plain text entries, add the text to the scene at a specified location (current 0, 2, 0)
• The added text can be scaled and moved with controller like other generated objects

Known Issues

• Can't use the whiteboard feature on the text (consistent with other generated objects)
• Can't rotate the text (consistent with other generated objects)
• Can't generate a display for other file types. This is expected and scheduled to be worked on in the next few weeks.

[ApolloZhu]

I've requested @ebanisadr's review since you'll need to implement displaying images on top of changes introduced in this PR. Let me know if I should alter anything for your needs that you anticipate.

[ebanisadr]

A problem I'm having is that generated objects that collide with each other get a velocity, and since they're not affected by gravity they tend to float away; see video.

edu.washington.cs.realitylab.xrcapstone22wi_team8-20220208-112752.mp4

[ApolloZhu]

@ebanisadr that is a problem with the MVP branch, which this PR doesn't change. unity-firebase branch should have the dropdown menu for selecting files and I'm not seeing that in your recording. Can you confirm you are building the correct branch?

[ApolloZhu]

@KH-Kyle is it safe to remove the RigidBody from primitive prefabs now? I believe that will fix the floating away issue (and you can commit directly to MVP after testing

[ebanisadr]

Good point, thought this was the PR to merge mvp into master.

[KH-Kyle]

@KH-Kyle is it safe to remove the RigidBody from primitive prefabs now? I believe that will fix the floating away issue (and you can commit directly to MVP after testing

Yeah. We changed them during yesterday's meeting but it didn't update in the repo. I just update the mvp branch.