Add payload and registry machinery for SideStake class #1719

Job	Run time
Lint	1m 0s
ARM [GOAL install] [buster]	3m 32s
Win32	3m 48s
Win64	3m 49s
macOS 11 native [GOAL install] [GUI] [no depends]	6m 50s
i386 Linux [GOAL install] [focal]	3m 49s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	3m 48s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	3m 48s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	3m 51s
	34m 15s

Provide feedback