Import 970f011682: Added menu behavior incl Edit>Refresh Scene & custom shader toggling (by Caitlyn)

[daleglass]

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

Commit:	970f011682a9f2297b0ca4cce9a0df4020ea31e3
Author:	Caitlyn
Date:	Sat, 11 Apr 2020 23:34

Added menu behavior incl Edit>Refresh Scene & custom shader toggling

Stats:

Filename	Stats	Lines	Added	Removed	Lines in blame
interface/src/Application.cpp		53	53	0	3
interface/src/Application.h		1	1	0	⚠ 0
interface/src/Menu.cpp		21	15	6	2
interface/src/Menu.h		5	2	3	⚠ 0
4 files	-	80	71	9	5

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git cherry-pick 970f011682a9f2297b0ca4cce9a0df4020ea31e3