Improvements to opening downlinks and simplification of the ActionContext. #229

Job	Run time
Clippy	1m 16s
Check (windows-latest)	1m 52s
Code Coverage	19m 25s
Build Example Application UIs (stocks_simulated/ui, npm install && npm run build)	16s
Check (ubuntu-latest)	41s
Check (macos-latest)	1m 9s
Documentation	44s
Rustfmt	23s
Test (windows-latest)	5m 1s
Test (ubuntu-latest)	2m 20s
Test (macos-latest)	2m 36s
	35m 43s

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