add hotkeys to diffviewer for next/prev, first/last (#1450) #3111

Job	Run time
Prepare version string	3s
Build / Build macOS (Intel)	5m 21s
Build / Build macOS (Apple Silicon)	2m 32s
Build / Build Windows ARM64	3m 48s
Build / Build Linux	2m 55s
Build / Build Linux (arm64)	3m 20s
Build / Build Windows x64	4m 8s
Package / Package Linux (linux-arm64)	59s
Package / Package Linux (linux-x64)	57s
Package / Package macOS (osx-x64)	14s
Package / Package Windows (win-x64)	24s
Package / Package Windows (win-arm64)	30s
Package / Package macOS (osx-arm64)	17s
	25m 28s

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