Implement sidestake description validation #1766

Job	Run time
macOS 11 native [GOAL install] [GUI] [no depends]	21m 31s
Lint	1m 19s
ARM [GOAL install] [buster]	14m 17s
Win32	20m 36s
Win64	22m 56s
i386 Linux [GOAL install] [focal]	15m 50s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	27m 1s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	26m 5s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	14m 36s
	2h 44m 11s

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