Implementation of add, edit, and delete sidestake buttons in options #1757

Job	Run time
Lint	1m 16s
ARM [GOAL install] [buster]	3m 57s
Win32	4m 13s
macOS 11 native [GOAL install] [GUI] [no depends]	15m 53s
Win64	8m 28s
i386 Linux [GOAL install] [focal]	2m 47s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	25m 2s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	23m 8s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	20m 52s
	1h 45m 36s

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