Import bef1942fe5: Changed avatar orbs to toggle-able avatar placeholder images w/menu option (by Caitlyn)

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This is an automated proposal to look at a commit made by Caitlyn and import it into Overte

Commit:	bef1942fe50284213bec2a41923d07201f53c7a2
Author:	Caitlyn
Date:	Tue, 28 Apr 2020 21:02

Changed avatar orbs to toggle-able avatar placeholder images w/menu option

Stats:

Filename	Stats	Lines	Added	Removed	Lines in blame
interface/src/Menu.cpp		10	9	1	9
interface/src/Menu.h		1	1	0	1
interface/src/avatar/AvatarManager.cpp		18	12	6	12
interface/src/avatar/AvatarManager.h		10	10	0	10
interface/src/avatar/OtherAvatar.cpp		30	25	5	25
interface/src/avatar/OtherAvatar.h		1	1	0	1
6 files	-	70	58	12	58

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