Add payload and registry machinery for SideStake class #1718

Job	Run time
Lint	1m 4s
macOS 11 native [GOAL install] [GUI] [no depends]	21m 57s
ARM [GOAL install] [buster]	4m 36s
Win32	4m 57s
Win64	4m 57s
i386 Linux [GOAL install] [focal]	4m 56s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	4m 55s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	4m 55s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	4m 56s
	57m 13s

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